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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 437 · 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. 1.497 − 16 =
  2. 2.393 − 49 =
  3. 3.209 − 77 =
  4. 4.248 − 89 =
  5. 5.482 − 29 =
  6. 6.209 − 28 =
  7. 7.63 − 19 =
  8. 8.395 − 18 =
  9. 9.110 − 28 =
  10. 10.499 − 27 =
  11. 11.181 − 79 =
  12. 12.166 − 37 =
  13. 13.586 − 49 =
  14. 14.166 − 77 =
  15. 15.514 − 36 =
  16. 16.418 − 19 =
  17. 17.500 − 28 =
  18. 18.106 − 57 =
  19. 19.146 − 97 =
  20. 20.85 − 78 =
  21. 21.546 − 78 =
  22. 22.116 − 56 =
  23. 23.291 − 77 =
  24. 24.60 − 38 =
  25. 25.389 − 66 =
  26. 26.521 − 17 =
  27. 27.164 − 38 =
  28. 28.265 − 28 =
  29. 29.318 − 78 =
  30. 30.155 − 66 =
  31. 31.325 − 97 =
  32. 32.244 − 49 =
  33. 33.291 − 98 =
  34. 34.54 − 48 =
  35. 35.186 − 68 =
  36. 36.450 − 36 =
  37. 37.152 − 78 =
  38. 38.341 − 29 =
  39. 39.429 − 86 =
  40. 40.210 − 89 =

Answer key

  1. 481
  2. 344
  3. 132
  4. 159
  5. 453
  6. 181
  7. 44
  8. 377
  9. 82
  10. 472
  11. 102
  12. 129
  13. 537
  14. 89
  15. 478
  16. 399
  17. 472
  18. 49
  19. 49
  20. 7
  21. 468
  22. 60
  23. 214
  24. 22
  25. 323
  26. 504
  27. 126
  28. 237
  29. 240
  30. 89
  31. 228
  32. 195
  33. 193
  34. 6
  35. 118
  36. 414
  37. 74
  38. 312
  39. 343
  40. 121

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