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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 40 · 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. 1.161 − 27 =
  2. 2.507 − 77 =
  3. 3.588 − 76 =
  4. 4.138 − 58 =
  5. 5.344 − 29 =
  6. 6.472 − 57 =
  7. 7.145 − 36 =
  8. 8.507 − 57 =
  9. 9.76 − 27 =
  10. 10.244 − 87 =
  11. 11.139 − 89 =
  12. 12.155 − 66 =
  13. 13.71 − 19 =
  14. 14.116 − 19 =
  15. 15.489 − 46 =
  16. 16.116 − 16 =
  17. 17.578 − 16 =
  18. 18.280 − 46 =
  19. 19.354 − 66 =
  20. 20.108 − 46 =
  21. 21.204 − 36 =
  22. 22.548 − 38 =
  23. 23.281 − 28 =
  24. 24.378 − 49 =
  25. 25.180 − 86 =
  26. 26.279 − 26 =
  27. 27.478 − 58 =
  28. 28.360 − 16 =
  29. 29.462 − 39 =
  30. 30.104 − 27 =
  31. 31.459 − 77 =
  32. 32.77 − 68 =
  33. 33.278 − 49 =
  34. 34.413 − 96 =
  35. 35.330 − 67 =
  36. 36.514 − 88 =
  37. 37.550 − 37 =
  38. 38.225 − 47 =
  39. 39.380 − 36 =
  40. 40.574 − 99 =

Answer key

  1. 134
  2. 430
  3. 512
  4. 80
  5. 315
  6. 415
  7. 109
  8. 450
  9. 49
  10. 157
  11. 50
  12. 89
  13. 52
  14. 97
  15. 443
  16. 100
  17. 562
  18. 234
  19. 288
  20. 62
  21. 168
  22. 510
  23. 253
  24. 329
  25. 94
  26. 253
  27. 420
  28. 344
  29. 423
  30. 77
  31. 382
  32. 9
  33. 229
  34. 317
  35. 263
  36. 426
  37. 513
  38. 178
  39. 344
  40. 475

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