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- 1. 2-2 Mental Math: Using Compatible #s and Compensation Math Notes Mathematical Reasoning 1.0
- 2. Compatible Numbers Compatible numbers are numbers that are easy to compute mentally. 19 + 25 + 11 = 30 + 25 = 55
- 3. Compensation Numbers Compensation involves deciding which number to adjust to make it easier to add or subtract. Compensate by changing the other number. 47 + 16 Add 3 Subtract 3 to adjust 50 + 13 = 63
- 4. Compensation Numbers Compensation involves deciding which number to adjust to make it easier to add or subtract. Compensate by changing the other number. 73 - 38 Add 2 Add 2 to adjust 75 - 40 = 35
- 5. Guided Practice 9 + 1 + 25 = Any numbers you 9 + 1 = 10 can easily add FIRST to make this easier? 10 + 25 = __
- 6. Guided Practice 9 + 1 + 25 =
- 7. Guided Practice 9 + 1 + 25 = Any numbers you can easily add FIRST to make this easier?
- 8. Guided Practice 9 + 1 + 25 = Any numbers you 9 + 1 = 10 can easily add FIRST to make this easier?
- 9. Guided Practice 9 + 1 + 25 = Any numbers you 9 + 1 = 10 can easily add FIRST to make this easier? 10 + 25 = __
- 10. Guided Practice 9 + 1 + 25 = Any numbers you 9 + 1 = 10 can easily add FIRST to make this easier? 35 10 + 25 = __
- 11. Guided Practice 7 + 13 + 19 =
- 12. Guided Practice 7 + 13 + 19 = Any numbers you can easily add FIRST to make this easier?
- 13. Guided Practice 7 + 13 + 19 = Any numbers you 7 + 13 = 20 can easily add FIRST to make this easier?
- 14. Guided Practice 7 + 13 + 19 = Any numbers you 7 + 13 = 20 can easily add FIRST to make this easier? 20 + 19 = __
- 15. Guided Practice 7 + 13 + 19 = Any numbers you 7 + 13 = 20 can easily add FIRST to make this easier? 39 20 + 19 = __
- 16. Guided Practice 29 + 37 =
- 17. Guided Practice Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away.
- 18. Guided Practice +1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away.
- 19. Guided Practice +1 -1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away.
- 20. Guided Practice +1 -1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away. 30
- 21. Guided Practice +1 -1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away. 30 36
- 22. Guided Practice +1 -1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away. 30 36 30 + 36 = __
- 23. Guided Practice +1 -1 Remember, this is 29 + 37 = COMPENSATION with adding. ADD something, TAKE something away. 30 36 30 + 36 = 66 __
- 24. Guided Practice 67 + 14 =
- 25. Guided Practice Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away.
- 26. Guided Practice +3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away.
- 27. Guided Practice +3 -3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away.
- 28. Guided Practice +3 -3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away. 70
- 29. Guided Practice +3 -3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away. 70 11
- 30. Guided Practice +3 -3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away. 70 11 70 + 11 = __
- 31. Guided Practice +3 -3 Remember, this is 67 + 14 = COMPENSATION with adding. ADD something, TAKE something away. 70 11 81 70 + 11 = __
- 32. Guided Practice 38 - 19 =
- 33. Guided Practice Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 34. Guided Practice +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 35. Guided Practice +2 +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 36. Guided Practice +2 +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers. 40
- 37. Guided Practice +2 +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers. 40 21
- 38. Guided Practice +2 +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers. 40 21 40 - 21 = __
- 39. Guided Practice +2 +2 Remember, this is 38 - 19 = COMPENSATION with subtracting. ADD something to BOTH numbers. 40 21 19 40 - 21 = __
- 40. Guided Practice 89 - 37 =
- 41. Guided Practice Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 42. Guided Practice -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 43. Guided Practice -4 -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers.
- 44. Guided Practice -4 -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers. 85
- 45. Guided Practice -4 -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers. 85 33
- 46. Guided Practice -4 -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers. 85 33 85 - 33 = __
- 47. Guided Practice -4 -4 Remember, this is 89 - 37 = COMPENSATION with subtracting. ADD something to BOTH numbers. 85 33 85 - 33 = 52 __

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