1 / 24

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.

senona
Download Presentation

Mental Math

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related