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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 782 · 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. 1.309 − 66 =
  2. 2.279 − 67 =
  3. 3.254 − 88 =
  4. 4.159 − 18 =
  5. 5.583 − 19 =
  6. 6.92 − 48 =
  7. 7.553 − 18 =
  8. 8.518 − 16 =
  9. 9.570 − 19 =
  10. 10.106 − 69 =
  11. 11.511 − 56 =
  12. 12.97 − 29 =
  13. 13.223 − 58 =
  14. 14.117 − 79 =
  15. 15.522 − 68 =
  16. 16.117 − 57 =
  17. 17.135 − 39 =
  18. 18.159 − 28 =
  19. 19.175 − 19 =
  20. 20.585 − 79 =
  21. 21.116 − 88 =
  22. 22.300 − 47 =
  23. 23.207 − 36 =
  24. 24.443 − 38 =
  25. 25.450 − 59 =
  26. 26.441 − 89 =
  27. 27.250 − 26 =
  28. 28.354 − 77 =
  29. 29.152 − 66 =
  30. 30.186 − 86 =
  31. 31.129 − 36 =
  32. 32.145 − 87 =
  33. 33.445 − 48 =
  34. 34.338 − 29 =
  35. 35.180 − 96 =
  36. 36.473 − 97 =
  37. 37.364 − 69 =
  38. 38.577 − 79 =
  39. 39.188 − 88 =
  40. 40.162 − 86 =

Answer key

  1. 243
  2. 212
  3. 166
  4. 141
  5. 564
  6. 44
  7. 535
  8. 502
  9. 551
  10. 37
  11. 455
  12. 68
  13. 165
  14. 38
  15. 454
  16. 60
  17. 96
  18. 131
  19. 156
  20. 506
  21. 28
  22. 253
  23. 171
  24. 405
  25. 391
  26. 352
  27. 224
  28. 277
  29. 86
  30. 100
  31. 93
  32. 58
  33. 397
  34. 309
  35. 84
  36. 376
  37. 295
  38. 498
  39. 100
  40. 76

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