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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 786 · 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. 1.370 − 97 =
  2. 2.564 − 18 =
  3. 3.327 − 69 =
  4. 4.366 − 29 =
  5. 5.122 − 98 =
  6. 6.180 − 69 =
  7. 7.376 − 77 =
  8. 8.263 − 36 =
  9. 9.173 − 59 =
  10. 10.175 − 96 =
  11. 11.377 − 68 =
  12. 12.195 − 89 =
  13. 13.64 − 58 =
  14. 14.390 − 49 =
  15. 15.281 − 27 =
  16. 16.408 − 67 =
  17. 17.175 − 79 =
  18. 18.566 − 48 =
  19. 19.197 − 88 =
  20. 20.298 − 18 =
  21. 21.107 − 29 =
  22. 22.230 − 27 =
  23. 23.488 − 17 =
  24. 24.214 − 66 =
  25. 25.88 − 29 =
  26. 26.402 − 37 =
  27. 27.226 − 39 =
  28. 28.442 − 38 =
  29. 29.234 − 96 =
  30. 30.513 − 96 =
  31. 31.527 − 68 =
  32. 32.193 − 37 =
  33. 33.307 − 99 =
  34. 34.159 − 88 =
  35. 35.585 − 28 =
  36. 36.304 − 89 =
  37. 37.96 − 49 =
  38. 38.155 − 87 =
  39. 39.285 − 38 =
  40. 40.508 − 96 =

Answer key

  1. 273
  2. 546
  3. 258
  4. 337
  5. 24
  6. 111
  7. 299
  8. 227
  9. 114
  10. 79
  11. 309
  12. 106
  13. 6
  14. 341
  15. 254
  16. 341
  17. 96
  18. 518
  19. 109
  20. 280
  21. 78
  22. 203
  23. 471
  24. 148
  25. 59
  26. 365
  27. 187
  28. 404
  29. 138
  30. 417
  31. 459
  32. 156
  33. 208
  34. 71
  35. 557
  36. 215
  37. 47
  38. 68
  39. 247
  40. 412

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