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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 21 · 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. 1.104 − 99 =
  2. 2.339 − 17 =
  3. 3.596 − 26 =
  4. 4.376 − 38 =
  5. 5.401 − 46 =
  6. 6.193 − 68 =
  7. 7.106 − 48 =
  8. 8.246 − 28 =
  9. 9.347 − 68 =
  10. 10.249 − 37 =
  11. 11.387 − 27 =
  12. 12.138 − 68 =
  13. 13.299 − 86 =
  14. 14.475 − 28 =
  15. 15.59 − 58 =
  16. 16.159 − 76 =
  17. 17.557 − 96 =
  18. 18.356 − 56 =
  19. 19.349 − 98 =
  20. 20.285 − 98 =
  21. 21.410 − 87 =
  22. 22.190 − 97 =
  23. 23.73 − 16 =
  24. 24.581 − 67 =
  25. 25.295 − 39 =
  26. 26.81 − 19 =
  27. 27.481 − 37 =
  28. 28.549 − 47 =
  29. 29.167 − 47 =
  30. 30.59 − 38 =
  31. 31.346 − 87 =
  32. 32.427 − 37 =
  33. 33.125 − 46 =
  34. 34.497 − 16 =
  35. 35.89 − 79 =
  36. 36.103 − 87 =
  37. 37.502 − 68 =
  38. 38.149 − 88 =
  39. 39.145 − 38 =
  40. 40.274 − 98 =

Answer key

  1. 5
  2. 322
  3. 570
  4. 338
  5. 355
  6. 125
  7. 58
  8. 218
  9. 279
  10. 212
  11. 360
  12. 70
  13. 213
  14. 447
  15. 1
  16. 83
  17. 461
  18. 300
  19. 251
  20. 187
  21. 323
  22. 93
  23. 57
  24. 514
  25. 256
  26. 62
  27. 444
  28. 502
  29. 120
  30. 21
  31. 259
  32. 390
  33. 79
  34. 481
  35. 10
  36. 16
  37. 434
  38. 61
  39. 107
  40. 176

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