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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 955 · 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. 1.378 − 89 =
  2. 2.419 − 56 =
  3. 3.331 − 48 =
  4. 4.461 − 28 =
  5. 5.127 − 86 =
  6. 6.162 − 66 =
  7. 7.313 − 29 =
  8. 8.140 − 77 =
  9. 9.336 − 37 =
  10. 10.173 − 88 =
  11. 11.446 − 26 =
  12. 12.582 − 36 =
  13. 13.104 − 17 =
  14. 14.434 − 89 =
  15. 15.533 − 18 =
  16. 16.188 − 57 =
  17. 17.383 − 16 =
  18. 18.234 − 69 =
  19. 19.143 − 58 =
  20. 20.298 − 77 =
  21. 21.478 − 29 =
  22. 22.105 − 58 =
  23. 23.242 − 86 =
  24. 24.88 − 16 =
  25. 25.545 − 66 =
  26. 26.107 − 76 =
  27. 27.396 − 28 =
  28. 28.567 − 98 =
  29. 29.76 − 57 =
  30. 30.86 − 77 =
  31. 31.221 − 88 =
  32. 32.100 − 17 =
  33. 33.354 − 38 =
  34. 34.579 − 16 =
  35. 35.282 − 27 =
  36. 36.148 − 57 =
  37. 37.300 − 86 =
  38. 38.566 − 58 =
  39. 39.413 − 39 =
  40. 40.295 − 36 =

Answer key

  1. 289
  2. 363
  3. 283
  4. 433
  5. 41
  6. 96
  7. 284
  8. 63
  9. 299
  10. 85
  11. 420
  12. 546
  13. 87
  14. 345
  15. 515
  16. 131
  17. 367
  18. 165
  19. 85
  20. 221
  21. 449
  22. 47
  23. 156
  24. 72
  25. 479
  26. 31
  27. 368
  28. 469
  29. 19
  30. 9
  31. 133
  32. 83
  33. 316
  34. 563
  35. 255
  36. 91
  37. 214
  38. 508
  39. 374
  40. 259

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