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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 915 · 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. 1.465 − 57 =
  2. 2.150 − 86 =
  3. 3.204 − 17 =
  4. 4.72 − 66 =
  5. 5.377 − 87 =
  6. 6.79 − 28 =
  7. 7.164 − 37 =
  8. 8.87 − 36 =
  9. 9.490 − 36 =
  10. 10.183 − 59 =
  11. 11.124 − 76 =
  12. 12.107 − 89 =
  13. 13.104 − 97 =
  14. 14.328 − 48 =
  15. 15.287 − 17 =
  16. 16.455 − 29 =
  17. 17.542 − 17 =
  18. 18.575 − 96 =
  19. 19.240 − 86 =
  20. 20.291 − 56 =
  21. 21.163 − 56 =
  22. 22.581 − 17 =
  23. 23.167 − 68 =
  24. 24.598 − 28 =
  25. 25.174 − 58 =
  26. 26.596 − 69 =
  27. 27.78 − 49 =
  28. 28.557 − 79 =
  29. 29.224 − 89 =
  30. 30.202 − 17 =
  31. 31.543 − 48 =
  32. 32.130 − 19 =
  33. 33.480 − 17 =
  34. 34.193 − 47 =
  35. 35.450 − 89 =
  36. 36.287 − 19 =
  37. 37.430 − 47 =
  38. 38.246 − 76 =
  39. 39.181 − 48 =
  40. 40.157 − 68 =

Answer key

  1. 408
  2. 64
  3. 187
  4. 6
  5. 290
  6. 51
  7. 127
  8. 51
  9. 454
  10. 124
  11. 48
  12. 18
  13. 7
  14. 280
  15. 270
  16. 426
  17. 525
  18. 479
  19. 154
  20. 235
  21. 107
  22. 564
  23. 99
  24. 570
  25. 116
  26. 527
  27. 29
  28. 478
  29. 135
  30. 185
  31. 495
  32. 111
  33. 463
  34. 146
  35. 361
  36. 268
  37. 383
  38. 170
  39. 133
  40. 89

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