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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 14 · 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. 1.590 − 78 =
  2. 2.563 − 68 =
  3. 3.207 − 18 =
  4. 4.431 − 28 =
  5. 5.542 − 37 =
  6. 6.186 − 89 =
  7. 7.570 − 89 =
  8. 8.579 − 97 =
  9. 9.138 − 56 =
  10. 10.193 − 87 =
  11. 11.579 − 48 =
  12. 12.354 − 27 =
  13. 13.336 − 78 =
  14. 14.442 − 66 =
  15. 15.548 − 56 =
  16. 16.93 − 38 =
  17. 17.593 − 79 =
  18. 18.287 − 38 =
  19. 19.213 − 18 =
  20. 20.353 − 18 =
  21. 21.458 − 69 =
  22. 22.135 − 86 =
  23. 23.149 − 67 =
  24. 24.265 − 26 =
  25. 25.439 − 99 =
  26. 26.574 − 17 =
  27. 27.361 − 76 =
  28. 28.574 − 36 =
  29. 29.287 − 36 =
  30. 30.472 − 99 =
  31. 31.556 − 36 =
  32. 32.327 − 39 =
  33. 33.183 − 29 =
  34. 34.249 − 76 =
  35. 35.272 − 48 =
  36. 36.428 − 68 =
  37. 37.259 − 88 =
  38. 38.142 − 56 =
  39. 39.149 − 88 =
  40. 40.261 − 96 =

Answer key

  1. 512
  2. 495
  3. 189
  4. 403
  5. 505
  6. 97
  7. 481
  8. 482
  9. 82
  10. 106
  11. 531
  12. 327
  13. 258
  14. 376
  15. 492
  16. 55
  17. 514
  18. 249
  19. 195
  20. 335
  21. 389
  22. 49
  23. 82
  24. 239
  25. 340
  26. 557
  27. 285
  28. 538
  29. 251
  30. 373
  31. 520
  32. 288
  33. 154
  34. 173
  35. 224
  36. 360
  37. 171
  38. 86
  39. 61
  40. 165

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