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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 505 · 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. 1.118 − 57 =
  2. 2.152 − 66 =
  3. 3.168 − 39 =
  4. 4.493 − 16 =
  5. 5.534 − 28 =
  6. 6.195 − 16 =
  7. 7.155 − 27 =
  8. 8.471 − 69 =
  9. 9.170 − 87 =
  10. 10.225 − 89 =
  11. 11.251 − 47 =
  12. 12.180 − 26 =
  13. 13.129 − 88 =
  14. 14.282 − 39 =
  15. 15.203 − 49 =
  16. 16.162 − 16 =
  17. 17.483 − 66 =
  18. 18.177 − 96 =
  19. 19.158 − 66 =
  20. 20.404 − 78 =
  21. 21.70 − 56 =
  22. 22.345 − 49 =
  23. 23.366 − 76 =
  24. 24.231 − 46 =
  25. 25.227 − 57 =
  26. 26.378 − 86 =
  27. 27.97 − 16 =
  28. 28.388 − 26 =
  29. 29.594 − 79 =
  30. 30.389 − 96 =
  31. 31.278 − 66 =
  32. 32.186 − 37 =
  33. 33.527 − 79 =
  34. 34.116 − 68 =
  35. 35.555 − 39 =
  36. 36.76 − 18 =
  37. 37.372 − 88 =
  38. 38.119 − 26 =
  39. 39.472 − 67 =
  40. 40.99 − 46 =

Answer key

  1. 61
  2. 86
  3. 129
  4. 477
  5. 506
  6. 179
  7. 128
  8. 402
  9. 83
  10. 136
  11. 204
  12. 154
  13. 41
  14. 243
  15. 154
  16. 146
  17. 417
  18. 81
  19. 92
  20. 326
  21. 14
  22. 296
  23. 290
  24. 185
  25. 170
  26. 292
  27. 81
  28. 362
  29. 515
  30. 293
  31. 212
  32. 149
  33. 448
  34. 48
  35. 516
  36. 58
  37. 284
  38. 93
  39. 405
  40. 53

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