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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 971 · 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. 1.476 − 26 =
  2. 2.403 − 47 =
  3. 3.175 − 47 =
  4. 4.142 − 99 =
  5. 5.186 − 88 =
  6. 6.85 − 59 =
  7. 7.547 − 48 =
  8. 8.237 − 59 =
  9. 9.82 − 77 =
  10. 10.199 − 49 =
  11. 11.588 − 18 =
  12. 12.470 − 36 =
  13. 13.546 − 88 =
  14. 14.462 − 58 =
  15. 15.129 − 38 =
  16. 16.316 − 16 =
  17. 17.326 − 88 =
  18. 18.389 − 96 =
  19. 19.464 − 29 =
  20. 20.443 − 36 =
  21. 21.149 − 68 =
  22. 22.164 − 89 =
  23. 23.209 − 99 =
  24. 24.391 − 76 =
  25. 25.122 − 57 =
  26. 26.103 − 78 =
  27. 27.187 − 68 =
  28. 28.588 − 99 =
  29. 29.543 − 69 =
  30. 30.64 − 28 =
  31. 31.319 − 27 =
  32. 32.279 − 26 =
  33. 33.130 − 27 =
  34. 34.140 − 86 =
  35. 35.355 − 17 =
  36. 36.582 − 39 =
  37. 37.406 − 97 =
  38. 38.190 − 76 =
  39. 39.375 − 68 =
  40. 40.204 − 86 =

Answer key

  1. 450
  2. 356
  3. 128
  4. 43
  5. 98
  6. 26
  7. 499
  8. 178
  9. 5
  10. 150
  11. 570
  12. 434
  13. 458
  14. 404
  15. 91
  16. 300
  17. 238
  18. 293
  19. 435
  20. 407
  21. 81
  22. 75
  23. 110
  24. 315
  25. 65
  26. 25
  27. 119
  28. 489
  29. 474
  30. 36
  31. 292
  32. 253
  33. 103
  34. 54
  35. 338
  36. 543
  37. 309
  38. 114
  39. 307
  40. 118

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