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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 471 · 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. 1.281 − 49 =
  2. 2.584 − 67 =
  3. 3.103 − 98 =
  4. 4.294 − 78 =
  5. 5.357 − 18 =
  6. 6.377 − 29 =
  7. 7.453 − 69 =
  8. 8.298 − 16 =
  9. 9.58 − 28 =
  10. 10.356 − 97 =
  11. 11.73 − 36 =
  12. 12.152 − 56 =
  13. 13.169 − 88 =
  14. 14.481 − 36 =
  15. 15.424 − 59 =
  16. 16.185 − 86 =
  17. 17.76 − 19 =
  18. 18.205 − 39 =
  19. 19.158 − 76 =
  20. 20.205 − 49 =
  21. 21.163 − 48 =
  22. 22.115 − 47 =
  23. 23.154 − 68 =
  24. 24.130 − 16 =
  25. 25.333 − 49 =
  26. 26.146 − 79 =
  27. 27.394 − 29 =
  28. 28.351 − 58 =
  29. 29.177 − 38 =
  30. 30.107 − 78 =
  31. 31.371 − 76 =
  32. 32.417 − 46 =
  33. 33.170 − 99 =
  34. 34.78 − 39 =
  35. 35.336 − 96 =
  36. 36.213 − 77 =
  37. 37.530 − 48 =
  38. 38.128 − 19 =
  39. 39.389 − 49 =
  40. 40.97 − 87 =

Answer key

  1. 232
  2. 517
  3. 5
  4. 216
  5. 339
  6. 348
  7. 384
  8. 282
  9. 30
  10. 259
  11. 37
  12. 96
  13. 81
  14. 445
  15. 365
  16. 99
  17. 57
  18. 166
  19. 82
  20. 156
  21. 115
  22. 68
  23. 86
  24. 114
  25. 284
  26. 67
  27. 365
  28. 293
  29. 139
  30. 29
  31. 295
  32. 371
  33. 71
  34. 39
  35. 240
  36. 136
  37. 482
  38. 109
  39. 340
  40. 10

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