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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 433 · 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. 1.169 − 49 =
  2. 2.506 − 96 =
  3. 3.316 − 77 =
  4. 4.92 − 89 =
  5. 5.294 − 76 =
  6. 6.107 − 76 =
  7. 7.234 − 38 =
  8. 8.558 − 69 =
  9. 9.355 − 66 =
  10. 10.101 − 49 =
  11. 11.474 − 48 =
  12. 12.572 − 16 =
  13. 13.498 − 46 =
  14. 14.172 − 99 =
  15. 15.111 − 76 =
  16. 16.394 − 36 =
  17. 17.82 − 38 =
  18. 18.151 − 28 =
  19. 19.152 − 96 =
  20. 20.53 − 28 =
  21. 21.387 − 66 =
  22. 22.163 − 78 =
  23. 23.177 − 28 =
  24. 24.204 − 56 =
  25. 25.133 − 29 =
  26. 26.74 − 27 =
  27. 27.94 − 79 =
  28. 28.185 − 46 =
  29. 29.151 − 68 =
  30. 30.465 − 86 =
  31. 31.322 − 36 =
  32. 32.462 − 98 =
  33. 33.170 − 88 =
  34. 34.522 − 48 =
  35. 35.389 − 99 =
  36. 36.484 − 96 =
  37. 37.124 − 47 =
  38. 38.293 − 59 =
  39. 39.496 − 18 =
  40. 40.489 − 38 =

Answer key

  1. 120
  2. 410
  3. 239
  4. 3
  5. 218
  6. 31
  7. 196
  8. 489
  9. 289
  10. 52
  11. 426
  12. 556
  13. 452
  14. 73
  15. 35
  16. 358
  17. 44
  18. 123
  19. 56
  20. 25
  21. 321
  22. 85
  23. 149
  24. 148
  25. 104
  26. 47
  27. 15
  28. 139
  29. 83
  30. 379
  31. 286
  32. 364
  33. 82
  34. 474
  35. 290
  36. 388
  37. 77
  38. 234
  39. 478
  40. 451

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