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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 517 · 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. 1.71 − 36 =
  2. 2.180 − 58 =
  3. 3.561 − 86 =
  4. 4.197 − 97 =
  5. 5.379 − 57 =
  6. 6.172 − 48 =
  7. 7.106 − 56 =
  8. 8.587 − 26 =
  9. 9.444 − 38 =
  10. 10.274 − 88 =
  11. 11.559 − 99 =
  12. 12.265 − 56 =
  13. 13.363 − 19 =
  14. 14.443 − 97 =
  15. 15.85 − 58 =
  16. 16.332 − 27 =
  17. 17.154 − 86 =
  18. 18.301 − 39 =
  19. 19.552 − 48 =
  20. 20.530 − 68 =
  21. 21.414 − 29 =
  22. 22.279 − 39 =
  23. 23.344 − 26 =
  24. 24.512 − 16 =
  25. 25.352 − 36 =
  26. 26.224 − 99 =
  27. 27.255 − 19 =
  28. 28.57 − 27 =
  29. 29.131 − 76 =
  30. 30.113 − 58 =
  31. 31.406 − 16 =
  32. 32.179 − 38 =
  33. 33.527 − 36 =
  34. 34.338 − 79 =
  35. 35.95 − 86 =
  36. 36.148 − 59 =
  37. 37.304 − 99 =
  38. 38.467 − 19 =
  39. 39.359 − 37 =
  40. 40.569 − 56 =

Answer key

  1. 35
  2. 122
  3. 475
  4. 100
  5. 322
  6. 124
  7. 50
  8. 561
  9. 406
  10. 186
  11. 460
  12. 209
  13. 344
  14. 346
  15. 27
  16. 305
  17. 68
  18. 262
  19. 504
  20. 462
  21. 385
  22. 240
  23. 318
  24. 496
  25. 316
  26. 125
  27. 236
  28. 30
  29. 55
  30. 55
  31. 390
  32. 141
  33. 491
  34. 259
  35. 9
  36. 89
  37. 205
  38. 448
  39. 322
  40. 513

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