Buzz
In tackling Problem 1 from Page 71 of Math 5 Workbook: Introduction to Mental Multiplication with Two-Digit Numbers using 11, Mental Calculation
Guidance for Problem 1 on Page 71 of Math 4 Workbook
Problem Statement: Mental Calculation. a) 34 x 11; b) 11 x 95; c) 82 x 11
Methodology for Mental Multiplication: Two-Digit Number by 11:
Answer: a) 34 x 11 = ?
Mental Calculation: 3 plus 4 equals 7 ;
Write 7 between the two digits of 34, resulting in 374.
Thus: 34 x 11 = 374.
b) 11 x 95 = ?
Mental Calculation: 9 plus 5 equals 14 ;
Write 4 between the two digits of 95, resulting in 945 ;
Add 1 to 9 of 945, resulting in 1045.
Thus: 11 x 95 = 1045.
c) 82 x 11 = ?
Mental Calculation: 8 plus 2 equals 10 ;
Write 0 between the two digits of 82, resulting in 802 ;
Add 1 to 8 of 802 to get 902.
Thus: 82 x 11 = 902.
Section: Math 4 Exercise Solutions - Page 71
