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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 279 · 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. 1.372 − 66 =
  2. 2.272 − 96 =
  3. 3.486 − 19 =
  4. 4.276 − 68 =
  5. 5.251 − 36 =
  6. 6.421 − 17 =
  7. 7.199 − 29 =
  8. 8.154 − 46 =
  9. 9.203 − 88 =
  10. 10.128 − 96 =
  11. 11.532 − 49 =
  12. 12.266 − 27 =
  13. 13.300 − 57 =
  14. 14.210 − 76 =
  15. 15.202 − 27 =
  16. 16.201 − 57 =
  17. 17.551 − 88 =
  18. 18.501 − 66 =
  19. 19.316 − 19 =
  20. 20.94 − 46 =
  21. 21.518 − 28 =
  22. 22.113 − 17 =
  23. 23.222 − 57 =
  24. 24.279 − 16 =
  25. 25.64 − 27 =
  26. 26.445 − 96 =
  27. 27.293 − 39 =
  28. 28.69 − 36 =
  29. 29.159 − 98 =
  30. 30.512 − 46 =
  31. 31.184 − 98 =
  32. 32.152 − 67 =
  33. 33.307 − 97 =
  34. 34.186 − 98 =
  35. 35.298 − 57 =
  36. 36.407 − 59 =
  37. 37.374 − 77 =
  38. 38.173 − 89 =
  39. 39.162 − 89 =
  40. 40.558 − 37 =

Answer key

  1. 306
  2. 176
  3. 467
  4. 208
  5. 215
  6. 404
  7. 170
  8. 108
  9. 115
  10. 32
  11. 483
  12. 239
  13. 243
  14. 134
  15. 175
  16. 144
  17. 463
  18. 435
  19. 297
  20. 48
  21. 490
  22. 96
  23. 165
  24. 263
  25. 37
  26. 349
  27. 254
  28. 33
  29. 61
  30. 466
  31. 86
  32. 85
  33. 210
  34. 88
  35. 241
  36. 348
  37. 297
  38. 84
  39. 73
  40. 521

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