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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 211 · 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. 1.68 − 38 =
  2. 2.82 − 39 =
  3. 3.249 − 66 =
  4. 4.509 − 16 =
  5. 5.195 − 56 =
  6. 6.114 − 59 =
  7. 7.356 − 89 =
  8. 8.362 − 47 =
  9. 9.283 − 36 =
  10. 10.180 − 96 =
  11. 11.86 − 66 =
  12. 12.347 − 78 =
  13. 13.116 − 48 =
  14. 14.371 − 87 =
  15. 15.493 − 39 =
  16. 16.472 − 38 =
  17. 17.338 − 46 =
  18. 18.119 − 76 =
  19. 19.482 − 86 =
  20. 20.181 − 97 =
  21. 21.446 − 78 =
  22. 22.277 − 39 =
  23. 23.438 − 46 =
  24. 24.399 − 97 =
  25. 25.380 − 28 =
  26. 26.320 − 89 =
  27. 27.430 − 26 =
  28. 28.425 − 76 =
  29. 29.501 − 48 =
  30. 30.221 − 67 =
  31. 31.445 − 46 =
  32. 32.135 − 96 =
  33. 33.102 − 89 =
  34. 34.131 − 68 =
  35. 35.529 − 86 =
  36. 36.419 − 18 =
  37. 37.490 − 86 =
  38. 38.422 − 18 =
  39. 39.542 − 96 =
  40. 40.136 − 48 =

Answer key

  1. 30
  2. 43
  3. 183
  4. 493
  5. 139
  6. 55
  7. 267
  8. 315
  9. 247
  10. 84
  11. 20
  12. 269
  13. 68
  14. 284
  15. 454
  16. 434
  17. 292
  18. 43
  19. 396
  20. 84
  21. 368
  22. 238
  23. 392
  24. 302
  25. 352
  26. 231
  27. 404
  28. 349
  29. 453
  30. 154
  31. 399
  32. 39
  33. 13
  34. 63
  35. 443
  36. 401
  37. 404
  38. 404
  39. 446
  40. 88

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