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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 499 · 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. 1.541 − 87 =
  2. 2.136 − 98 =
  3. 3.576 − 89 =
  4. 4.153 − 49 =
  5. 5.143 − 97 =
  6. 6.223 − 87 =
  7. 7.116 − 87 =
  8. 8.146 − 46 =
  9. 9.327 − 69 =
  10. 10.432 − 18 =
  11. 11.440 − 76 =
  12. 12.202 − 88 =
  13. 13.238 − 17 =
  14. 14.215 − 26 =
  15. 15.123 − 69 =
  16. 16.191 − 19 =
  17. 17.461 − 97 =
  18. 18.404 − 77 =
  19. 19.444 − 76 =
  20. 20.280 − 58 =
  21. 21.92 − 37 =
  22. 22.108 − 68 =
  23. 23.412 − 57 =
  24. 24.487 − 68 =
  25. 25.340 − 26 =
  26. 26.445 − 76 =
  27. 27.599 − 36 =
  28. 28.63 − 28 =
  29. 29.182 − 49 =
  30. 30.381 − 39 =
  31. 31.594 − 18 =
  32. 32.189 − 19 =
  33. 33.225 − 88 =
  34. 34.125 − 39 =
  35. 35.162 − 77 =
  36. 36.259 − 86 =
  37. 37.145 − 26 =
  38. 38.201 − 18 =
  39. 39.298 − 78 =
  40. 40.238 − 98 =

Answer key

  1. 454
  2. 38
  3. 487
  4. 104
  5. 46
  6. 136
  7. 29
  8. 100
  9. 258
  10. 414
  11. 364
  12. 114
  13. 221
  14. 189
  15. 54
  16. 172
  17. 364
  18. 327
  19. 368
  20. 222
  21. 55
  22. 40
  23. 355
  24. 419
  25. 314
  26. 369
  27. 563
  28. 35
  29. 133
  30. 342
  31. 576
  32. 170
  33. 137
  34. 86
  35. 85
  36. 173
  37. 119
  38. 183
  39. 220
  40. 140

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