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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 841 · 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. 1.95 − 76 =
  2. 2.96 − 76 =
  3. 3.151 − 89 =
  4. 4.189 − 66 =
  5. 5.481 − 98 =
  6. 6.546 − 77 =
  7. 7.121 − 79 =
  8. 8.226 − 98 =
  9. 9.53 − 28 =
  10. 10.448 − 26 =
  11. 11.182 − 27 =
  12. 12.137 − 48 =
  13. 13.152 − 79 =
  14. 14.129 − 46 =
  15. 15.79 − 78 =
  16. 16.189 − 36 =
  17. 17.247 − 56 =
  18. 18.104 − 79 =
  19. 19.569 − 59 =
  20. 20.153 − 59 =
  21. 21.84 − 46 =
  22. 22.207 − 87 =
  23. 23.499 − 98 =
  24. 24.135 − 88 =
  25. 25.103 − 86 =
  26. 26.89 − 59 =
  27. 27.96 − 69 =
  28. 28.186 − 48 =
  29. 29.88 − 69 =
  30. 30.426 − 96 =
  31. 31.531 − 39 =
  32. 32.223 − 86 =
  33. 33.152 − 26 =
  34. 34.308 − 86 =
  35. 35.178 − 38 =
  36. 36.296 − 76 =
  37. 37.225 − 26 =
  38. 38.405 − 66 =
  39. 39.331 − 39 =
  40. 40.260 − 68 =

Answer key

  1. 19
  2. 20
  3. 62
  4. 123
  5. 383
  6. 469
  7. 42
  8. 128
  9. 25
  10. 422
  11. 155
  12. 89
  13. 73
  14. 83
  15. 1
  16. 153
  17. 191
  18. 25
  19. 510
  20. 94
  21. 38
  22. 120
  23. 401
  24. 47
  25. 17
  26. 30
  27. 27
  28. 138
  29. 19
  30. 330
  31. 492
  32. 137
  33. 126
  34. 222
  35. 140
  36. 220
  37. 199
  38. 339
  39. 292
  40. 192

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