1. negative of (4 squared) is -4² = -(4)² = -(4 × 4) = -16. 2. (negative 4) squared is (-4)² = (-4 × -4) = 16. Use parentheses to clearly indicate which calculation you really want to happen. Squared. A number n squared is written as n² and n² = n × n. If n is an integer then n² is a perfect square.Sounds tough, but once you have mastered the 10× table, it is just a few steps away. Firstly, 11× is mostly easy: from 11×2 to 11×9 you just put the two digits together. 11×2=22, 11×3=33, ..., 11×9=99. And of course 2×, 5× and 10× just follow their simple rules you know already. So it just leaves these to remember: Step 1: Enter the radical expression below for which you want to calculate the square root. The square root calculator finds the square root of the given radical expression. If a given number is a perfect square, you will get a final answer in exact form. If a given number is not a perfect square, you will get a final answer in exact form and ... Free Pre-Algebra, Algebra, Trigonometry, Calculus, Geometry, Statistics and Chemistry calculators step-by-stepFree math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.Online math solver with free step by step solutions to algebra, calculus, and other math problems. Get help on the web or with our math app. Associative property of multiplication: Changing the grouping of factors does not change the product. For example, (2 \times 3) \times 4 = 2 \times (3 \times 4) (2×3)×4 = 2×(3×4). Identity property of multiplication: The product of 1 1 and any number is that number. For example, 7 \times 1 = 7 7 ×1 = 7. Associative property of multiplication: Changing the grouping of factors does not change the product. For example, (2 \times 3) \times 4 = 2 \times (3 \times 4) (2×3)×4 = 2×(3×4). Identity property of multiplication: The product of 1 1 and any number is that number. For example, 7 \times 1 = 7 7 ×1 = 7. How to Use the Calculator. Type your algebra problem into the text box. For example, enter 3x+2=14 into the text box to get a step-by-step explanation of how to solve 3x+2=14.Online math solver with free step by step solutions to algebra, calculus, and other math problems. Get help on the web or with our math app., the numerator is 3, and the denominator is 8. A more illustrative example could involve a pie with 8 slices. 1 of those 8 slices would constitute the numerator of a fraction, while the total of 8 slices that comprises the whole pie would be the denominator. If a person were to eat 3 slices, the remaining fraction of the pie would therefore beStep 1: Enter the radical expression below for which you want to calculate the square root. The square root calculator finds the square root of the given radical expression. If a given number is a perfect square, you will get a final answer in exact form. If a given number is not a perfect square, you will get a final answer in exact form and ... Symbolab is the best step by step calculator for a wide range of math problems, from basic arithmetic to advanced calculus and linear algebra. It shows you the solution, graph, detailed steps and explanations for each problem.Free Pre-Algebra, Algebra, Trigonometry, Calculus, Geometry, Statistics and Chemistry calculators step-by-stepWhat is x times x equal to in algebra?To solve x multiplied by x, try to observe the pattern created by letting x be any number.After creating your list of n...What is x times x equal to in algebra?To solve x multiplied by x, try to observe the pattern created by letting x be any number.After creating your list of n...Sep 2, 2012 · The numpy.repeat has been mentioned, and that's clearly the equivalent to what you want. But for completenes' sake, there's also repeat from the itertools standard library. . However, this is intended for iterables in general, so it doesn't allow repetions by index (because iterables in general do not have an index defin Understand Negative numbers, one step at a time. Step by steps for fractions, factoring, and prime factorization. Enter your math expression. x2 − 2x + 1 = 3x − 5. Get Chegg Math Solver. $9.95 per month (cancel anytime). See details.In order to show that T is a function, you need to prove that for each pair of subsets A and B of X there is one and only one subset U of X\times X such that T(A,B)=U, that is, ((A,B),U) \in T ...For X\times [0,M]: \times is the Cartesian product and [0,M] is the interval \{x:0 \le x \le M\}. So, X \times [0,M] = \{(x,r):x \in X \land 0 \le r \le M\} For Y ...For X\times [0,M]: \times is the Cartesian product and [0,M] is the interval \{x:0 \le x \le M\}. So, X \times [0,M] = \{(x,r):x \in X \land 0 \le r \le M\} For Y ...Defintion of proper homotopy https://math.stackexchange.com/questions/2532344/defintion-of-proper-homotopy Let X =R. The homotopy will be from the identity map to itself, so H (0,x)= H (1,x)= x for all x. For each integer n ≥ 1, during the time period [1/(n+1),1/n], the point n∈ X is ...Simplify ( square root of x-1)( square root of x+1) Step 1. Expand using the FOIL Method. Tap for more steps... Step 1.1. Apply the distributive property. Step 1.2.Simplify 1/ ( square root of x) 1 √x 1 x. Multiply 1 √x 1 x by √x √x x x. 1 √x ⋅ √x √x 1 x ⋅ x x. Combine and simplify the denominator.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.See the entire simplification process below: Explanation: The rules for order of operation say to execute the multiplication in this problem first: 2x−9×x+8 →2x−9x+8 ... Equivalent metrics gives the same topology, so we can show that the metrics are equivalent, I'll replace d(x1,y1)= x and d(x2,y2) = y and show that they are equivalent.Calculus. Solve for x 1/x=0. 1 x = 0 1 x = 0. Set the numerator equal to zero. 1 = 0 1 = 0. Since 1 ≠ 0 1 ≠ 0, there are no solutions. Step 1: Enter the radical expression below for which you want to calculate the square root. The square root calculator finds the square root of the given radical expression. If a given number is a perfect square, you will get a final answer in exact form. If a given number is not a perfect square, you will get a final answer in exact form and ...May 25, 2020 · Which expression is equivalent to log Subscript 12 Baseline StartFraction x Superscript 4 Baseline StartRoot x cubed minus 2 EndRoot Over (x + 1) Superscript 5 Baseline EndFraction? 4 log Subscript 12 Baseline x + one-half log Subscript 12 Baseline (x cubed minus 2) minus 5 log Subscript 12 Baseline (x times 1) By ‘ The law of exponents ‘ , a^n × a^m = a^n+m. Therefore , e^x × e^x = e^x+x = e^2x . Find out how many invertible and diagonal solutions X 2 − 2X = 0 has when X ∈ R3×3. If X is invertible, then multiplying each side of X 2−2X = 0 by the inverse of X gives us that X −2I = 0 and so X = 2I. For the case where X is diagonal, let X ... Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly. Associative property of multiplication: Changing the grouping of factors does not change the product. For example, (2 \times 3) \times 4 = 2 \times (3 \times 4) (2×3)×4 = 2×(3×4). Identity property of multiplication: The product of 1 1 and any number is that number. For example, 7 \times 1 = 7 7 ×1 = 7. Which says the absolute value of x equals: x when x is greater than zero; 0 when x equals 0; −x when x is less than zero (this "flips" the number back to positive) So when a number is positive or zero we leave it alone, when it is negative we change it to positive using −x.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. View solution steps Evaluate x Graph Quiz Polynomial x×1 Similar Problems from Web Search What does X × {0} and Y × {1} mean in this proof? https://math.stackexchange.com/q/2332997 A×B = {(a,b):a ∈ A,b ∈ B}. This is called the Cartesian product. For example {a,b,c}×{0,1} ={(a,0),(b,0),(c,0),(a,1),(b,1),(c,1)} In the context of the proof, ... Algebra. Multiply (x-5) (x-1) (x − 5) (x − 1) ( x - 5) ( x - 1) Expand (x−5)(x− 1) ( x - 5) ( x - 1) using the FOIL Method. Tap for more steps... x⋅x+x⋅ −1−5x−5⋅−1 x ⋅ x + x ⋅ - 1 - 5 x - 5 ⋅ - 1. Simplify and combine like terms. Tap for more steps... x2 − 6x+5 x 2 - 6 x + 5.Apr 29, 2023 · An exponent is a way to represent how many times a number, known as the base, is multiplied by itself. It is represented as a small number in the upper right hand corner of the base. For example: x² means you multiply x by itself two times, which is x × x. Likewise, 4² = 4 × 4, etc. If the exponent is 3, in the example 5³, then the result ... A graduation cap is an example of a mapping cylinder g : X \to Y where X = S^1, Y = [-2,2] \times [-2,2], and g is the inclusion map. Verifying continuity of the deformation retraction of the mapping cylinderHow to Use the Calculator. Type your algebra problem into the text box. For example, enter 3x+2=14 into the text box to get a step-by-step explanation of how to solve 3x+2=14.The three integrals from 1 to 2, from 2 to 4, and from 4 to 8 are all equal. Each region is the previous region halved vertically and doubled horizontally. Extending this, the integral from 1 to 2 k is k times the integral from 1 to 2, just as ln 2 k = k ln 2. Calculus. In real calculus, the derivative of 1/x = x −1 is given by the power rule ... The pH scale is logarithmic, meaning that an increase or decrease of an integer value changes the concentration by a tenfold. For example, a pH of 3 is ten times more acidic than a pH of 4. Likewise, a pH of 3 is one hundred times more acidic than a pH of 5. Similarly a pH of 11 is ten times more basic than a pH of 10.In order to show that T is a function, you need to prove that for each pair of subsets A and B of X there is one and only one subset U of X\times X such that T(A,B)=U, that is, ((A,B),U) \in T ...Algebra. Simplify 1/2x^ (-1/2) 1 2 x−1 2 1 2 x - 1 2. Rewrite the expression using the negative exponent rule b−n = 1 bn b - n = 1 b n. 1 2 ⋅ 1 x1 2 1 2 ⋅ 1 x 1 2. Combine. 1⋅1 2x1 2 1 ⋅ 1 2 x 1 2. Multiply 1 1 by 1 1. 1 2x1 2 1 2 x 1 2.Dec 18, 2022 · (x) x 1 =x. Why is a number to the first power equal the same number? The following is not a proof or a reason, but it's a demonstrationthat might be intuitively satisfying:'X' mentioned 4 times: X times X times X times X = X to the fourth power'X' mentioned 3 times: X times X times X = X to the third power'X' mentioned 2 times: X times X = X to the second power'X' mentioned 1 time: X = X to ... Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.B- 8. Which expression is equivalent to (StartFraction 125 squared Over 125 Superscript four-thirds Baseline EndFraction? D- 25. Which of the following is equivalent to 36 Superscript negative one-half? D- 1/6. Which expression is equivalent to (x Superscript 27 Baseline y) Superscript one-third? B- x^9 (3cubed squareroot y)Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ... Free Square Roots calculator - Find square roots of any number step-by-step The numpy.repeat has been mentioned, and that's clearly the equivalent to what you want. But for completenes' sake, there's also repeat from the itertools standard library. . However, this is intended for iterables in general, so it doesn't allow repetions by index (because iterables in general do not have an index definSolve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.We could have factored this numerator as x plus 4 times x plus 1. 4 times 1 is 4. 4 plus 1 is 5, all of that over x plus 4. That cancels out and you're left just with x plus 1. Either way would have worked, but the algebraic long division will always work, even if you can't cancel out factors like that, even if you did have a remainder.For X\times [0,M]: \times is the Cartesian product and [0,M] is the interval \{x:0 \le x \le M\}. So, X \times [0,M] = \{(x,r):x \in X \land 0 \le r \le M\} For Y ...Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.Dec 18, 2022 · (x) x 1 =x. Why is a number to the first power equal the same number? The following is not a proof or a reason, but it's a demonstrationthat might be intuitively satisfying:'X' mentioned 4 times: X times X times X times X = X to the fourth power'X' mentioned 3 times: X times X times X = X to the third power'X' mentioned 2 times: X times X = X to the second power'X' mentioned 1 time: X = X to ... View solution steps Evaluate x Graph Quiz Polynomial x×1 Similar Problems from Web Search What does X × {0} and Y × {1} mean in this proof? https://math.stackexchange.com/q/2332997 A×B = {(a,b):a ∈ A,b ∈ B}. This is called the Cartesian product. For example {a,b,c}×{0,1} ={(a,0),(b,0),(c,0),(a,1),(b,1),(c,1)} In the context of the proof, ...Solved X Times Examples: 12x X 2x = ? 12x X 2x = 24x 2. 4x X 2x = ? 4x X 2x =8 2. 2x X 6x = ? 2x X 6x = 12x 2. 3x X 3x = ? 3x X 3x = 9x 2. 9x X 27x = ? 9x X 27x = 243 ...To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x-1 and x+1 is \left(x-1\right)\left(x+1\right). Symbolab is the best step by step calculator for a wide range of math problems, from basic arithmetic to advanced calculus and linear algebra. It shows you the solution, graph, detailed steps and explanations for each problem.Defintion of proper homotopy https://math.stackexchange.com/questions/2532344/defintion-of-proper-homotopy Let X =R. The homotopy will be from the identity map to itself, so H (0,x)= H (1,x)= x for all x. For each integer n ≥ 1, during the time period [1/(n+1),1/n], the point n∈ X is ...By ‘ The law of exponents ‘ , a^n × a^m = a^n+m. Therefore , e^x × e^x = e^x+x = e^2x . Find out how many invertible and diagonal solutions X 2 − 2X = 0 has when X ∈ R3×3. If X is invertible, then multiplying each side of X 2−2X = 0 by the inverse of X gives us that X −2I = 0 and so X = 2I. For the case where X is diagonal, let X ...The fraction calculator is easy to use. First select if you want to use the default or mixed fraction calculator. Fill in two fractions and choose if you want to add, subtract, multiply or divide and click the "Calculate" button. The result is a (mixed) fraction reduced to it’s simplest form. Also a table with the result fraction converted in ... Online math solver with free step by step solutions to algebra, calculus, and other math problems. Get help on the web or with our math app. Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more. How to Use the Calculator. Type your algebra problem into the text box. For example, enter 3x+2=14 into the text box to get a step-by-step explanation of how to solve 3x+2=14.1.225 × 10 5 + 3.655 × 10 3 = 1.26155 x 10 5. E Notation. E notation is also known as exponential notation. E notation is the same as scientific notation where a decimal number between 1 and 10 is multiplied by 10 raised to some power. In E notation the "times 10 raised to a power" is replaced with the letter e in either uppercase or lowercase.Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.You enter the first fraction, you enter the second fraction, click "Calculate" and hey presto, you get the answer. You can also click the little icon after the calculator to find out more information about the process of subtracting one fraction from another. (Note: you need to have performed a calculation first or the link won't work!)Add, subtract, multiply and divide decimal numbers with this calculator. You can use: Positive or negative decimals. For negative numbers insert a leading negative or minus sign before your number, like this: -45 or -356.5. Integers, decimals or scientific notation. For scientific notation use "e" notation like this: -3.5e8 or 4.7E-9.Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.Just like for the matrix-vector product, the product AB A B between matrices A A and B B is defined only if the number of columns in A A equals the number of rows in B B. In math terms, we say we can multiply an m × n m × n matrix A A by an n × p n × p matrix B B. (If p p happened to be 1, then B B would be an n × 1 n × 1 column vector ...Multiply (x-1) (x-1) (x − 1) (x − 1) ( x - 1) ( x - 1) Expand (x−1)(x− 1) ( x - 1) ( x - 1) using the FOIL Method. Tap for more steps... x⋅x+x⋅ −1−1x−1⋅−1 x ⋅ x + x ⋅ - 1 - 1 x - 1 ⋅ - 1 Simplify and combine like terms. Tap for more steps... x2 − 2x+1 x 2 - 2 x + 1Here's the rule: When you multiply two terms with the same base, the exponents add. So: x*x 1/2 = x 1+1/2 = x3/2. Upvote • 0 Downvote.The three integrals from 1 to 2, from 2 to 4, and from 4 to 8 are all equal. Each region is the previous region halved vertically and doubled horizontally. Extending this, the integral from 1 to 2 k is k times the integral from 1 to 2, just as ln 2 k = k ln 2. Calculus. In real calculus, the derivative of 1/x = x −1 is given by the power rule ...Solve for x sin (x)=1. sin(x) = 1 sin ( x) = 1. Take the inverse sine of both sides of the equation to extract x x from inside the sine. x = arcsin(1) x = arcsin ( 1) Simplify the right side. Tap for more steps... x = π 2 x = π 2. The sine function is positive in the first and second quadrants. To find the second solution, subtract the ...Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. For math, science, nutrition, history ... Simplify x^ (1/2)*x^ (1/2) x1 2 ⋅ x1 2 x 1 2 ⋅ x 1 2. Multiply x1 2 x 1 2 by x1 2 x 1 2 by adding the exponents. Tap for more steps... x1 x 1. Simplify x1 x 1. Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.View solution steps Evaluate x Graph Quiz Polynomial x×1 Similar Problems from Web Search What does X × {0} and Y × {1} mean in this proof? https://math.stackexchange.com/q/2332997 A×B = {(a,b):a ∈ A,b ∈ B}. This is called the Cartesian product. For example {a,b,c}×{0,1} ={(a,0),(b,0),(c,0),(a,1),(b,1),(c,1)} In the context of the proof, ...Mar 21, 2022 · Find the slope given: (-1,5) and (-4,10) Type a response -3 to the power of what equals -243 How many 2/5 foot pieces of wood can you cut from a board that is 10 3/5 feet long A graduation cap is an example of a mapping cylinder g : X \to Y where X = S^1, Y = [-2,2] \times [-2,2], and g is the inclusion map. Verifying continuity of the deformation retraction of the mapping cylinderTo add or subtract expressions, expand them to make their denominators the same. Least common multiple of x-1 and x+1 is \left(x-1\right)\left(x+1\right).
Suppose that Am×nx = 0 has a nontrivial solution x. Prove that, for some row vector z, the equation yA = z has no solution. Assume for contradiction that yA =z has a solution y for all vectors z. Now, multiply on the right by x. This gives, yAx= zx⇒ y(0)= zx⇒ zx = 0. Then, since x is not the zero .... Apshbujm.suspected
Just like for the matrix-vector product, the product AB A B between matrices A A and B B is defined only if the number of columns in A A equals the number of rows in B B. In math terms, we say we can multiply an m × n m × n matrix A A by an n × p n × p matrix B B. (If p p happened to be 1, then B B would be an n × 1 n × 1 column vector ... Free Algebraic Properties Calculator - Simplify radicals, exponents, logarithms, absolute values and complex numbers step-by-stepThe three integrals from 1 to 2, from 2 to 4, and from 4 to 8 are all equal. Each region is the previous region halved vertically and doubled horizontally. Extending this, the integral from 1 to 2 k is k times the integral from 1 to 2, just as ln 2 k = k ln 2. Calculus. In real calculus, the derivative of 1/x = x −1 is given by the power rule ...Suppose that Am×nx = 0 has a nontrivial solution x. Prove that, for some row vector z, the equation yA = z has no solution. Assume for contradiction that yA =z has a solution y for all vectors z. Now, multiply on the right by x. This gives, yAx= zx⇒ y(0)= zx⇒ zx = 0. Then, since x is not the zero ...x squared is a notation that is used to represent the expression \(x\times x\). i.e., x squared equals x multiplied by itself.Algebra. Simplify 1/2x^ (-1/2) 1 2 x−1 2 1 2 x - 1 2. Rewrite the expression using the negative exponent rule b−n = 1 bn b - n = 1 b n. 1 2 ⋅ 1 x1 2 1 2 ⋅ 1 x 1 2. Combine. 1⋅1 2x1 2 1 ⋅ 1 2 x 1 2. Multiply 1 1 by 1 1. 1 2x1 2 1 2 x 1 2. Which expression is equivalent to log subscript 12 baseline startfraction x superscript 4 baseline startroot x cubed minus 2 endroot over (x 1) superscript 5 baseline endfraction? 4 log subscript 12 baseline x one-half log subscript 12 baseline (x cubed minus 2) minus 5 log subscript 12 baseline (x times 1) 4 log subscript 12 baseline x one-half log subscript 12 baseline startfraction x cubed ...Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Suppose that Am×nx = 0 has a nontrivial solution x. Prove that, for some row vector z, the equation yA = z has no solution. Assume for contradiction that yA =z has a solution y for all vectors z. Now, multiply on the right by x. This gives, yAx= zx⇒ y(0)= zx⇒ zx = 0. Then, since x is not the zero ...View solution steps Evaluate x Graph Quiz Polynomial x×1 Similar Problems from Web Search What does X × {0} and Y × {1} mean in this proof? https://math.stackexchange.com/q/2332997 A×B = {(a,b):a ∈ A,b ∈ B}. This is called the Cartesian product. For example {a,b,c}×{0,1} ={(a,0),(b,0),(c,0),(a,1),(b,1),(c,1)} In the context of the proof, ... How to Use the Calculator. Type your algebra problem into the text box. For example, enter 3x+2=14 into the text box to get a step-by-step explanation of how to solve 3x+2=14. An exponent is the number of times to multiply a number by itself. Write an exponent as a raised number. In the number 2 4 (2 to the exponent 4, or 2 to the power of 4), the ‘4’ is the exponent. The ‘2’ is the number to multiply by itself 4 times over. In this case 2 x 2 x 2 x 2 = 16.Suppose that Am×nx = 0 has a nontrivial solution x. Prove that, for some row vector z, the equation yA = z has no solution. Assume for contradiction that yA =z has a solution y for all vectors z. Now, multiply on the right by x. This gives, yAx= zx⇒ y(0)= zx⇒ zx = 0. Then, since x is not the zero ...The three integrals from 1 to 2, from 2 to 4, and from 4 to 8 are all equal. Each region is the previous region halved vertically and doubled horizontally. Extending this, the integral from 1 to 2 k is k times the integral from 1 to 2, just as ln 2 k = k ln 2. Calculus. In real calculus, the derivative of 1/x = x −1 is given by the power rule ... See the entire simplification process below: Explanation: The rules for order of operation say to execute the multiplication in this problem first: 2x−9×x+8 →2x−9x+8 ... Equivalent metrics gives the same topology, so we can show that the metrics are equivalent, I'll replace d(x1,y1)= x and d(x2,y2) = y and show that they are equivalent.Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The three integrals from 1 to 2, from 2 to 4, and from 4 to 8 are all equal. Each region is the previous region halved vertically and doubled horizontally. Extending this, the integral from 1 to 2 k is k times the integral from 1 to 2, just as ln 2 k = k ln 2. Calculus. In real calculus, the derivative of 1/x = x −1 is given by the power rule ...Simplify ( square root of x-1)( square root of x+1) Step 1. Expand using the FOIL Method. Tap for more steps... Step 1.1. Apply the distributive property. Step 1.2.Sounds tough, but once you have mastered the 10× table, it is just a few steps away. Firstly, 11× is mostly easy: from 11×2 to 11×9 you just put the two digits together. 11×2=22, 11×3=33, ..., 11×9=99. And of course 2×, 5× and 10× just follow their simple rules you know already. So it just leaves these to remember:.