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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 536 · 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. 1.286 − 28 =
  2. 2.337 − 48 =
  3. 3.475 − 16 =
  4. 4.367 − 38 =
  5. 5.480 − 96 =
  6. 6.513 − 88 =
  7. 7.566 − 79 =
  8. 8.494 − 16 =
  9. 9.95 − 89 =
  10. 10.272 − 69 =
  11. 11.380 − 16 =
  12. 12.559 − 79 =
  13. 13.413 − 89 =
  14. 14.450 − 86 =
  15. 15.219 − 58 =
  16. 16.300 − 78 =
  17. 17.152 − 47 =
  18. 18.576 − 56 =
  19. 19.232 − 46 =
  20. 20.471 − 46 =
  21. 21.252 − 66 =
  22. 22.474 − 19 =
  23. 23.405 − 76 =
  24. 24.333 − 78 =
  25. 25.308 − 99 =
  26. 26.116 − 48 =
  27. 27.217 − 38 =
  28. 28.157 − 66 =
  29. 29.206 − 36 =
  30. 30.137 − 57 =
  31. 31.204 − 19 =
  32. 32.322 − 38 =
  33. 33.283 − 36 =
  34. 34.311 − 19 =
  35. 35.116 − 49 =
  36. 36.503 − 88 =
  37. 37.524 − 29 =
  38. 38.520 − 28 =
  39. 39.547 − 29 =
  40. 40.128 − 16 =

Answer key

  1. 258
  2. 289
  3. 459
  4. 329
  5. 384
  6. 425
  7. 487
  8. 478
  9. 6
  10. 203
  11. 364
  12. 480
  13. 324
  14. 364
  15. 161
  16. 222
  17. 105
  18. 520
  19. 186
  20. 425
  21. 186
  22. 455
  23. 329
  24. 255
  25. 209
  26. 68
  27. 179
  28. 91
  29. 170
  30. 80
  31. 185
  32. 284
  33. 247
  34. 292
  35. 67
  36. 415
  37. 495
  38. 492
  39. 518
  40. 112

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