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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 94 · 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. 1.175 − 57 =
  2. 2.316 − 99 =
  3. 3.580 − 37 =
  4. 4.168 − 68 =
  5. 5.115 − 89 =
  6. 6.178 − 19 =
  7. 7.548 − 78 =
  8. 8.96 − 28 =
  9. 9.346 − 77 =
  10. 10.113 − 98 =
  11. 11.199 − 96 =
  12. 12.509 − 16 =
  13. 13.153 − 68 =
  14. 14.206 − 69 =
  15. 15.144 − 48 =
  16. 16.124 − 66 =
  17. 17.415 − 46 =
  18. 18.478 − 57 =
  19. 19.122 − 17 =
  20. 20.110 − 16 =
  21. 21.230 − 58 =
  22. 22.528 − 26 =
  23. 23.57 − 26 =
  24. 24.330 − 76 =
  25. 25.523 − 38 =
  26. 26.584 − 57 =
  27. 27.73 − 27 =
  28. 28.478 − 18 =
  29. 29.269 − 27 =
  30. 30.106 − 86 =
  31. 31.544 − 36 =
  32. 32.548 − 18 =
  33. 33.57 − 17 =
  34. 34.226 − 37 =
  35. 35.586 − 99 =
  36. 36.211 − 39 =
  37. 37.243 − 96 =
  38. 38.279 − 47 =
  39. 39.346 − 18 =
  40. 40.111 − 47 =

Answer key

  1. 118
  2. 217
  3. 543
  4. 100
  5. 26
  6. 159
  7. 470
  8. 68
  9. 269
  10. 15
  11. 103
  12. 493
  13. 85
  14. 137
  15. 96
  16. 58
  17. 369
  18. 421
  19. 105
  20. 94
  21. 172
  22. 502
  23. 31
  24. 254
  25. 485
  26. 527
  27. 46
  28. 460
  29. 242
  30. 20
  31. 508
  32. 530
  33. 40
  34. 189
  35. 487
  36. 172
  37. 147
  38. 232
  39. 328
  40. 64

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