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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 101 · 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. 1.265 − 86 =
  2. 2.476 − 77 =
  3. 3.351 − 67 =
  4. 4.226 − 87 =
  5. 5.218 − 16 =
  6. 6.489 − 79 =
  7. 7.153 − 48 =
  8. 8.178 − 39 =
  9. 9.219 − 98 =
  10. 10.433 − 28 =
  11. 11.415 − 96 =
  12. 12.559 − 17 =
  13. 13.233 − 77 =
  14. 14.410 − 27 =
  15. 15.160 − 67 =
  16. 16.344 − 16 =
  17. 17.174 − 38 =
  18. 18.517 − 97 =
  19. 19.388 − 46 =
  20. 20.581 − 77 =
  21. 21.477 − 68 =
  22. 22.481 − 76 =
  23. 23.361 − 17 =
  24. 24.263 − 48 =
  25. 25.372 − 56 =
  26. 26.222 − 59 =
  27. 27.330 − 19 =
  28. 28.254 − 17 =
  29. 29.176 − 29 =
  30. 30.204 − 86 =
  31. 31.449 − 19 =
  32. 32.132 − 79 =
  33. 33.132 − 89 =
  34. 34.320 − 17 =
  35. 35.106 − 99 =
  36. 36.141 − 17 =
  37. 37.178 − 59 =
  38. 38.266 − 88 =
  39. 39.169 − 97 =
  40. 40.374 − 27 =

Answer key

  1. 179
  2. 399
  3. 284
  4. 139
  5. 202
  6. 410
  7. 105
  8. 139
  9. 121
  10. 405
  11. 319
  12. 542
  13. 156
  14. 383
  15. 93
  16. 328
  17. 136
  18. 420
  19. 342
  20. 504
  21. 409
  22. 405
  23. 344
  24. 215
  25. 316
  26. 163
  27. 311
  28. 237
  29. 147
  30. 118
  31. 430
  32. 53
  33. 43
  34. 303
  35. 7
  36. 124
  37. 119
  38. 178
  39. 72
  40. 347

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