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Mental Math

Mental Math. 01. (1). 48 + 135=. (2). 17 + 67 =. (3). 8 X 198=. (4). 57 – 32=. (5). 122 ÷ 4=. (6). 16 X 15 =. (7). 32 X 25 =. (8). 57+88=. (9). 8 4 x 6 =. (10). 432 ÷6=. end. Return to Beginning. solutions. (1). 48 + 135=. Think. 50 + 133= 183. Compensation.

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Mental Math

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  1. Mental Math 01

  2. (1) 48 + 135=

  3. (2) 17 + 67=

  4. (3) 8 X 198=

  5. (4) 57 – 32=

  6. (5) 122 ÷ 4=

  7. (6) 16 X 15 =

  8. (7) 32 X 25 =

  9. (8) 57+88=

  10. (9) 84x 6=

  11. (10) 432 ÷6=

  12. end Return to Beginning

  13. solutions

  14. (1) 48 + 135= Think 50 + 133=183 Compensation

  15. (1) 48 + 135= Think 50 + 135=185 185-2 = 183 Compensation

  16. (2) 17 + 77 = Think 10 + 77 = 87; 87 + 7 = 94 Break up and Bridge

  17. (3) 8 x 98= Think 8 x 100 = 800 800 – (2 x 8) = 784 Compensation

  18. (4) 57 – 32= Think 55 – 30= 25 Balance for a Constant Difference

  19. (5) 122 ÷ 4= Think 122 ÷ 2 ÷ 2 61 ÷ 2 = 30.5

  20. (6) 16 X 15 = Think 8 X 30 =240 Halving and Doubling

  21. (7) 32 X 25 = Think 8 X 4 X 25 = 8 x100 = 800 Compatible Factors

  22. (8) 57+88= Think = 50 + 80 = 130 and 7 + 8 = 15 =130 + 15=145 Front End Addition

  23. 84 x 6= (9) Think 80 x 6 = 480 4 x 6 = 24 480 + 24 = 504 Front End Multiplication

  24. (10) 432 ÷6= Think (420 + 12)÷6 =70+2 = 72 Partition the Dividend

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