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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 845 · 40 questions
TalentJR

The fast method (Shift both): How much makes the second number round? 68 needs 2 to make 70. Add that amount to BOTH numbers. Take away the round number.

NameDateTime takenScore ___ / 40
  1. 1.82 − 58 =
  2. 2.346 − 17 =
  3. 3.297 − 78 =
  4. 4.154 − 76 =
  5. 5.474 − 16 =
  6. 6.173 − 39 =
  7. 7.270 − 36 =
  8. 8.172 − 89 =
  9. 9.178 − 39 =
  10. 10.186 − 19 =
  11. 11.136 − 36 =
  12. 12.592 − 98 =
  13. 13.177 − 17 =
  14. 14.138 − 88 =
  15. 15.389 − 29 =
  16. 16.158 − 27 =
  17. 17.90 − 17 =
  18. 18.223 − 96 =
  19. 19.550 − 86 =
  20. 20.57 − 37 =
  21. 21.373 − 56 =
  22. 22.526 − 86 =
  23. 23.445 − 26 =
  24. 24.519 − 77 =
  25. 25.471 − 56 =
  26. 26.500 − 39 =
  27. 27.94 − 87 =
  28. 28.463 − 27 =
  29. 29.165 − 86 =
  30. 30.102 − 86 =
  31. 31.135 − 36 =
  32. 32.194 − 47 =
  33. 33.248 − 48 =
  34. 34.539 − 16 =
  35. 35.154 − 76 =
  36. 36.412 − 88 =
  37. 37.443 − 68 =
  38. 38.585 − 88 =
  39. 39.96 − 19 =
  40. 40.105 − 17 =

Answer key

  1. 24
  2. 329
  3. 219
  4. 78
  5. 458
  6. 134
  7. 234
  8. 83
  9. 139
  10. 167
  11. 100
  12. 494
  13. 160
  14. 50
  15. 360
  16. 131
  17. 73
  18. 127
  19. 464
  20. 20
  21. 317
  22. 440
  23. 419
  24. 442
  25. 415
  26. 461
  27. 7
  28. 436
  29. 79
  30. 16
  31. 99
  32. 147
  33. 200
  34. 523
  35. 78
  36. 324
  37. 375
  38. 497
  39. 77
  40. 88

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