Math tricks ppt (3)

The document provides 5 math tricks for multiplying and squaring numbers. Trick 1 explains how to multiply a number by 5 by dividing it by 2 and multiplying it by 10. Trick 2 shows how to multiply a double digit number by 11 by adding the two digits and placing the sum between them. Trick 3 demonstrates multiplying even numbers by 6 by dividing the number by 2 and using the remainder. Trick 4 describes multiplying a number by 9 by subtracting 1 from the number for the first digit and subtracting the number from 10 for the second digit. Trick 5 explains how to square a number ending in 5 by adding 1 to the first digit and multiplying that sum by the original first digit, followed by 25.