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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 642 · 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. 1.500 − 19 =
  2. 2.74 − 36 =
  3. 3.215 − 79 =
  4. 4.529 − 89 =
  5. 5.224 − 78 =
  6. 6.595 − 57 =
  7. 7.144 − 36 =
  8. 8.398 − 26 =
  9. 9.386 − 58 =
  10. 10.536 − 38 =
  11. 11.219 − 98 =
  12. 12.99 − 29 =
  13. 13.564 − 87 =
  14. 14.278 − 38 =
  15. 15.324 − 49 =
  16. 16.365 − 87 =
  17. 17.303 − 18 =
  18. 18.144 − 99 =
  19. 19.286 − 27 =
  20. 20.126 − 69 =
  21. 21.519 − 27 =
  22. 22.100 − 46 =
  23. 23.104 − 87 =
  24. 24.459 − 88 =
  25. 25.185 − 26 =
  26. 26.492 − 19 =
  27. 27.487 − 29 =
  28. 28.199 − 39 =
  29. 29.169 − 29 =
  30. 30.401 − 68 =
  31. 31.287 − 77 =
  32. 32.586 − 49 =
  33. 33.463 − 87 =
  34. 34.257 − 59 =
  35. 35.481 − 29 =
  36. 36.586 − 56 =
  37. 37.355 − 99 =
  38. 38.62 − 28 =
  39. 39.265 − 36 =
  40. 40.100 − 26 =

Answer key

  1. 481
  2. 38
  3. 136
  4. 440
  5. 146
  6. 538
  7. 108
  8. 372
  9. 328
  10. 498
  11. 121
  12. 70
  13. 477
  14. 240
  15. 275
  16. 278
  17. 285
  18. 45
  19. 259
  20. 57
  21. 492
  22. 54
  23. 17
  24. 371
  25. 159
  26. 473
  27. 458
  28. 160
  29. 140
  30. 333
  31. 210
  32. 537
  33. 376
  34. 198
  35. 452
  36. 530
  37. 256
  38. 34
  39. 229
  40. 74

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