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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 242 · 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. 1.508 − 26 =
  2. 2.117 − 19 =
  3. 3.444 − 86 =
  4. 4.196 − 87 =
  5. 5.452 − 86 =
  6. 6.582 − 16 =
  7. 7.183 − 19 =
  8. 8.506 − 78 =
  9. 9.108 − 26 =
  10. 10.497 − 16 =
  11. 11.70 − 17 =
  12. 12.419 − 39 =
  13. 13.95 − 39 =
  14. 14.519 − 16 =
  15. 15.112 − 97 =
  16. 16.211 − 46 =
  17. 17.256 − 29 =
  18. 18.396 − 36 =
  19. 19.177 − 37 =
  20. 20.592 − 36 =
  21. 21.531 − 67 =
  22. 22.315 − 88 =
  23. 23.448 − 29 =
  24. 24.193 − 68 =
  25. 25.431 − 87 =
  26. 26.246 − 68 =
  27. 27.316 − 36 =
  28. 28.218 − 96 =
  29. 29.243 − 28 =
  30. 30.200 − 16 =
  31. 31.353 − 16 =
  32. 32.322 − 96 =
  33. 33.121 − 66 =
  34. 34.226 − 56 =
  35. 35.307 − 76 =
  36. 36.390 − 87 =
  37. 37.400 − 48 =
  38. 38.310 − 46 =
  39. 39.421 − 86 =
  40. 40.222 − 57 =

Answer key

  1. 482
  2. 98
  3. 358
  4. 109
  5. 366
  6. 566
  7. 164
  8. 428
  9. 82
  10. 481
  11. 53
  12. 380
  13. 56
  14. 503
  15. 15
  16. 165
  17. 227
  18. 360
  19. 140
  20. 556
  21. 464
  22. 227
  23. 419
  24. 125
  25. 344
  26. 178
  27. 280
  28. 122
  29. 215
  30. 184
  31. 337
  32. 226
  33. 55
  34. 170
  35. 231
  36. 303
  37. 352
  38. 264
  39. 335
  40. 165

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