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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 275 · 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. 1.404 − 46 =
  2. 2.111 − 49 =
  3. 3.74 − 66 =
  4. 4.87 − 47 =
  5. 5.188 − 99 =
  6. 6.403 − 66 =
  7. 7.502 − 76 =
  8. 8.219 − 98 =
  9. 9.419 − 26 =
  10. 10.587 − 39 =
  11. 11.329 − 26 =
  12. 12.584 − 18 =
  13. 13.525 − 67 =
  14. 14.545 − 76 =
  15. 15.487 − 39 =
  16. 16.96 − 69 =
  17. 17.141 − 87 =
  18. 18.268 − 79 =
  19. 19.356 − 68 =
  20. 20.63 − 38 =
  21. 21.126 − 47 =
  22. 22.152 − 86 =
  23. 23.393 − 96 =
  24. 24.401 − 98 =
  25. 25.445 − 59 =
  26. 26.558 − 76 =
  27. 27.159 − 57 =
  28. 28.294 − 17 =
  29. 29.412 − 36 =
  30. 30.233 − 18 =
  31. 31.315 − 47 =
  32. 32.514 − 29 =
  33. 33.137 − 28 =
  34. 34.171 − 98 =
  35. 35.135 − 26 =
  36. 36.485 − 68 =
  37. 37.331 − 76 =
  38. 38.282 − 19 =
  39. 39.136 − 46 =
  40. 40.503 − 86 =

Answer key

  1. 358
  2. 62
  3. 8
  4. 40
  5. 89
  6. 337
  7. 426
  8. 121
  9. 393
  10. 548
  11. 303
  12. 566
  13. 458
  14. 469
  15. 448
  16. 27
  17. 54
  18. 189
  19. 288
  20. 25
  21. 79
  22. 66
  23. 297
  24. 303
  25. 386
  26. 482
  27. 102
  28. 277
  29. 376
  30. 215
  31. 268
  32. 485
  33. 109
  34. 73
  35. 109
  36. 417
  37. 255
  38. 263
  39. 90
  40. 417

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