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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 502 · 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. 1.131 − 39 =
  2. 2.121 − 16 =
  3. 3.209 − 98 =
  4. 4.160 − 99 =
  5. 5.176 − 36 =
  6. 6.83 − 66 =
  7. 7.460 − 97 =
  8. 8.293 − 66 =
  9. 9.154 − 76 =
  10. 10.450 − 36 =
  11. 11.403 − 66 =
  12. 12.181 − 46 =
  13. 13.584 − 76 =
  14. 14.285 − 39 =
  15. 15.236 − 79 =
  16. 16.314 − 37 =
  17. 17.493 − 88 =
  18. 18.322 − 29 =
  19. 19.499 − 36 =
  20. 20.149 − 67 =
  21. 21.78 − 46 =
  22. 22.431 − 87 =
  23. 23.286 − 98 =
  24. 24.522 − 37 =
  25. 25.96 − 49 =
  26. 26.154 − 98 =
  27. 27.226 − 67 =
  28. 28.52 − 37 =
  29. 29.267 − 16 =
  30. 30.59 − 46 =
  31. 31.444 − 46 =
  32. 32.180 − 89 =
  33. 33.165 − 96 =
  34. 34.176 − 78 =
  35. 35.139 − 27 =
  36. 36.112 − 97 =
  37. 37.319 − 48 =
  38. 38.117 − 57 =
  39. 39.225 − 29 =
  40. 40.346 − 87 =

Answer key

  1. 92
  2. 105
  3. 111
  4. 61
  5. 140
  6. 17
  7. 363
  8. 227
  9. 78
  10. 414
  11. 337
  12. 135
  13. 508
  14. 246
  15. 157
  16. 277
  17. 405
  18. 293
  19. 463
  20. 82
  21. 32
  22. 344
  23. 188
  24. 485
  25. 47
  26. 56
  27. 159
  28. 15
  29. 251
  30. 13
  31. 398
  32. 91
  33. 69
  34. 98
  35. 112
  36. 15
  37. 271
  38. 60
  39. 196
  40. 259

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