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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 708 · 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. 1.93 − 66 =
  2. 2.273 − 57 =
  3. 3.131 − 27 =
  4. 4.383 − 26 =
  5. 5.174 − 47 =
  6. 6.63 − 36 =
  7. 7.394 − 69 =
  8. 8.406 − 48 =
  9. 9.402 − 58 =
  10. 10.251 − 29 =
  11. 11.167 − 57 =
  12. 12.463 − 18 =
  13. 13.458 − 96 =
  14. 14.562 − 57 =
  15. 15.546 − 67 =
  16. 16.394 − 68 =
  17. 17.221 − 46 =
  18. 18.177 − 89 =
  19. 19.288 − 46 =
  20. 20.411 − 57 =
  21. 21.134 − 99 =
  22. 22.578 − 69 =
  23. 23.214 − 39 =
  24. 24.315 − 59 =
  25. 25.466 − 59 =
  26. 26.444 − 96 =
  27. 27.164 − 29 =
  28. 28.339 − 47 =
  29. 29.347 − 17 =
  30. 30.153 − 57 =
  31. 31.289 − 46 =
  32. 32.195 − 86 =
  33. 33.285 − 77 =
  34. 34.380 − 98 =
  35. 35.227 − 77 =
  36. 36.399 − 97 =
  37. 37.284 − 46 =
  38. 38.223 − 56 =
  39. 39.107 − 69 =
  40. 40.167 − 49 =

Answer key

  1. 27
  2. 216
  3. 104
  4. 357
  5. 127
  6. 27
  7. 325
  8. 358
  9. 344
  10. 222
  11. 110
  12. 445
  13. 362
  14. 505
  15. 479
  16. 326
  17. 175
  18. 88
  19. 242
  20. 354
  21. 35
  22. 509
  23. 175
  24. 256
  25. 407
  26. 348
  27. 135
  28. 292
  29. 330
  30. 96
  31. 243
  32. 109
  33. 208
  34. 282
  35. 150
  36. 302
  37. 238
  38. 167
  39. 38
  40. 118

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