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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 574 · 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. 1.150 − 27 =
  2. 2.168 − 39 =
  3. 3.352 − 49 =
  4. 4.59 − 27 =
  5. 5.529 − 16 =
  6. 6.82 − 38 =
  7. 7.555 − 86 =
  8. 8.104 − 89 =
  9. 9.586 − 99 =
  10. 10.241 − 18 =
  11. 11.462 − 29 =
  12. 12.314 − 17 =
  13. 13.98 − 18 =
  14. 14.155 − 36 =
  15. 15.338 − 28 =
  16. 16.355 − 39 =
  17. 17.554 − 27 =
  18. 18.210 − 68 =
  19. 19.136 − 79 =
  20. 20.181 − 97 =
  21. 21.418 − 59 =
  22. 22.112 − 28 =
  23. 23.115 − 59 =
  24. 24.239 − 88 =
  25. 25.344 − 19 =
  26. 26.586 − 18 =
  27. 27.329 − 29 =
  28. 28.153 − 36 =
  29. 29.217 − 66 =
  30. 30.356 − 99 =
  31. 31.121 − 88 =
  32. 32.357 − 27 =
  33. 33.198 − 98 =
  34. 34.370 − 99 =
  35. 35.536 − 56 =
  36. 36.200 − 88 =
  37. 37.141 − 56 =
  38. 38.215 − 56 =
  39. 39.66 − 38 =
  40. 40.173 − 16 =

Answer key

  1. 123
  2. 129
  3. 303
  4. 32
  5. 513
  6. 44
  7. 469
  8. 15
  9. 487
  10. 223
  11. 433
  12. 297
  13. 80
  14. 119
  15. 310
  16. 316
  17. 527
  18. 142
  19. 57
  20. 84
  21. 359
  22. 84
  23. 56
  24. 151
  25. 325
  26. 568
  27. 300
  28. 117
  29. 151
  30. 257
  31. 33
  32. 330
  33. 100
  34. 271
  35. 480
  36. 112
  37. 85
  38. 159
  39. 28
  40. 157

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