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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 532 · 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. 1.586 − 86 =
  2. 2.256 − 46 =
  3. 3.234 − 18 =
  4. 4.191 − 89 =
  5. 5.244 − 89 =
  6. 6.494 − 26 =
  7. 7.562 − 27 =
  8. 8.156 − 27 =
  9. 9.513 − 69 =
  10. 10.193 − 16 =
  11. 11.333 − 16 =
  12. 12.500 − 29 =
  13. 13.555 − 99 =
  14. 14.532 − 46 =
  15. 15.98 − 26 =
  16. 16.192 − 97 =
  17. 17.145 − 67 =
  18. 18.225 − 99 =
  19. 19.526 − 97 =
  20. 20.291 − 26 =
  21. 21.178 − 78 =
  22. 22.458 − 89 =
  23. 23.493 − 26 =
  24. 24.336 − 19 =
  25. 25.195 − 27 =
  26. 26.517 − 47 =
  27. 27.505 − 46 =
  28. 28.165 − 27 =
  29. 29.599 − 69 =
  30. 30.186 − 86 =
  31. 31.523 − 57 =
  32. 32.213 − 49 =
  33. 33.158 − 27 =
  34. 34.111 − 46 =
  35. 35.221 − 18 =
  36. 36.201 − 57 =
  37. 37.146 − 19 =
  38. 38.88 − 49 =
  39. 39.71 − 38 =
  40. 40.193 − 56 =

Answer key

  1. 500
  2. 210
  3. 216
  4. 102
  5. 155
  6. 468
  7. 535
  8. 129
  9. 444
  10. 177
  11. 317
  12. 471
  13. 456
  14. 486
  15. 72
  16. 95
  17. 78
  18. 126
  19. 429
  20. 265
  21. 100
  22. 369
  23. 467
  24. 317
  25. 168
  26. 470
  27. 459
  28. 138
  29. 530
  30. 100
  31. 466
  32. 164
  33. 131
  34. 65
  35. 203
  36. 144
  37. 127
  38. 39
  39. 33
  40. 137

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