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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 320 · 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. 1.531 − 38 =
  2. 2.82 − 76 =
  3. 3.93 − 78 =
  4. 4.121 − 68 =
  5. 5.151 − 76 =
  6. 6.176 − 46 =
  7. 7.197 − 68 =
  8. 8.379 − 58 =
  9. 9.52 − 37 =
  10. 10.199 − 66 =
  11. 11.304 − 19 =
  12. 12.405 − 17 =
  13. 13.250 − 16 =
  14. 14.350 − 17 =
  15. 15.220 − 86 =
  16. 16.236 − 99 =
  17. 17.120 − 27 =
  18. 18.440 − 98 =
  19. 19.461 − 29 =
  20. 20.147 − 16 =
  21. 21.207 − 69 =
  22. 22.178 − 96 =
  23. 23.565 − 36 =
  24. 24.448 − 19 =
  25. 25.53 − 29 =
  26. 26.82 − 18 =
  27. 27.148 − 99 =
  28. 28.551 − 37 =
  29. 29.188 − 59 =
  30. 30.180 − 56 =
  31. 31.392 − 38 =
  32. 32.65 − 29 =
  33. 33.355 − 68 =
  34. 34.432 − 89 =
  35. 35.596 − 57 =
  36. 36.287 − 17 =
  37. 37.185 − 79 =
  38. 38.507 − 96 =
  39. 39.147 − 56 =
  40. 40.480 − 67 =

Answer key

  1. 493
  2. 6
  3. 15
  4. 53
  5. 75
  6. 130
  7. 129
  8. 321
  9. 15
  10. 133
  11. 285
  12. 388
  13. 234
  14. 333
  15. 134
  16. 137
  17. 93
  18. 342
  19. 432
  20. 131
  21. 138
  22. 82
  23. 529
  24. 429
  25. 24
  26. 64
  27. 49
  28. 514
  29. 129
  30. 124
  31. 354
  32. 36
  33. 287
  34. 343
  35. 539
  36. 270
  37. 106
  38. 411
  39. 91
  40. 413

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