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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 272 · 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. 1.450 − 29 =
  2. 2.140 − 96 =
  3. 3.574 − 67 =
  4. 4.98 − 17 =
  5. 5.153 − 76 =
  6. 6.294 − 47 =
  7. 7.190 − 19 =
  8. 8.427 − 47 =
  9. 9.314 − 69 =
  10. 10.163 − 68 =
  11. 11.217 − 66 =
  12. 12.535 − 86 =
  13. 13.251 − 67 =
  14. 14.548 − 86 =
  15. 15.565 − 68 =
  16. 16.281 − 89 =
  17. 17.171 − 17 =
  18. 18.450 − 27 =
  19. 19.420 − 19 =
  20. 20.263 − 36 =
  21. 21.394 − 46 =
  22. 22.252 − 98 =
  23. 23.200 − 19 =
  24. 24.587 − 78 =
  25. 25.160 − 86 =
  26. 26.437 − 26 =
  27. 27.383 − 58 =
  28. 28.433 − 88 =
  29. 29.533 − 78 =
  30. 30.237 − 88 =
  31. 31.331 − 78 =
  32. 32.377 − 36 =
  33. 33.497 − 76 =
  34. 34.217 − 58 =
  35. 35.146 − 87 =
  36. 36.300 − 68 =
  37. 37.250 − 19 =
  38. 38.78 − 28 =
  39. 39.158 − 69 =
  40. 40.218 − 47 =

Answer key

  1. 421
  2. 44
  3. 507
  4. 81
  5. 77
  6. 247
  7. 171
  8. 380
  9. 245
  10. 95
  11. 151
  12. 449
  13. 184
  14. 462
  15. 497
  16. 192
  17. 154
  18. 423
  19. 401
  20. 227
  21. 348
  22. 154
  23. 181
  24. 509
  25. 74
  26. 411
  27. 325
  28. 345
  29. 455
  30. 149
  31. 253
  32. 341
  33. 421
  34. 159
  35. 59
  36. 232
  37. 231
  38. 50
  39. 89
  40. 171

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