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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 570 · 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. 1.499 − 38 =
  2. 2.315 − 67 =
  3. 3.451 − 19 =
  4. 4.384 − 58 =
  5. 5.509 − 59 =
  6. 6.578 − 36 =
  7. 7.564 − 16 =
  8. 8.589 − 69 =
  9. 9.418 − 96 =
  10. 10.147 − 78 =
  11. 11.78 − 48 =
  12. 12.135 − 96 =
  13. 13.464 − 57 =
  14. 14.503 − 77 =
  15. 15.189 − 18 =
  16. 16.137 − 48 =
  17. 17.271 − 89 =
  18. 18.362 − 89 =
  19. 19.410 − 26 =
  20. 20.207 − 39 =
  21. 21.74 − 28 =
  22. 22.487 − 19 =
  23. 23.371 − 96 =
  24. 24.516 − 36 =
  25. 25.91 − 56 =
  26. 26.71 − 66 =
  27. 27.518 − 48 =
  28. 28.130 − 17 =
  29. 29.180 − 86 =
  30. 30.347 − 87 =
  31. 31.135 − 19 =
  32. 32.130 − 26 =
  33. 33.62 − 36 =
  34. 34.178 − 36 =
  35. 35.209 − 78 =
  36. 36.314 − 98 =
  37. 37.272 − 68 =
  38. 38.79 − 36 =
  39. 39.527 − 89 =
  40. 40.343 − 37 =

Answer key

  1. 461
  2. 248
  3. 432
  4. 326
  5. 450
  6. 542
  7. 548
  8. 520
  9. 322
  10. 69
  11. 30
  12. 39
  13. 407
  14. 426
  15. 171
  16. 89
  17. 182
  18. 273
  19. 384
  20. 168
  21. 46
  22. 468
  23. 275
  24. 480
  25. 35
  26. 5
  27. 470
  28. 113
  29. 94
  30. 260
  31. 116
  32. 104
  33. 26
  34. 142
  35. 131
  36. 216
  37. 204
  38. 43
  39. 438
  40. 306

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