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Mental Math

Mental Math. 01. (1). 48 + 135=. (2). 1200–1455=1202 – ? . (3). 9 X 7=. (4). 57 – 32=. (5). 122 ÷ 4=. (6). 16 X 15 =. (7). 9 X 6 X 5=. (8). 32 X 25 =. (9). 3 4 =. (10) Estimate. 33% of $25.62. end. Return to Beginning. solutions. (1). 48 + 135=. Think.

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Mental Math

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  1. Mental Math 01

  2. (1) 48 + 135=

  3. (2) 1200–1455=1202 – ?

  4. (3) 9 X 7=

  5. (4) 57 – 32=

  6. (5) 122 ÷ 4=

  7. (6) 16 X 15 =

  8. (7) 9X 6 X 5=

  9. (8) 32 X 25 =

  10. (9) 34 =

  11. (10) Estimate 33% of $25.62

  12. end Return to Beginning

  13. solutions

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

  15. (2) 1200–1455=1202 – ? Think 1200 + 2 = 1202 1455 + 2 = 1457

  16. (3) 9 X 7= Think Answer must be in the 60’s Digits must add to 9 Answer: 63

  17. (4) 57 – 32= Think 55 – 30= 25

  18. (5) 122 ÷ 4= Think 122 ÷ 2 ÷ 2 61 ÷ 2 = 30.5

  19. (6) 16 X 15 = Think 8 X 30 =240

  20. (7) 9X 6 X 5= Think 9X 30=270

  21. (8) 32 X 25 = Think 8 X 4 X 25 =800

  22. (9) 34 = Think 3x3x3x3= 9 x 9 = 81

  23. (10) Estimate 33% of $25.62 Think 1/3 of $27=$9

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