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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 740 · 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. 1.206 − 89 =
  2. 2.521 − 16 =
  3. 3.294 − 19 =
  4. 4.320 − 59 =
  5. 5.124 − 29 =
  6. 6.58 − 26 =
  7. 7.413 − 28 =
  8. 8.183 − 16 =
  9. 9.276 − 17 =
  10. 10.163 − 76 =
  11. 11.73 − 36 =
  12. 12.265 − 69 =
  13. 13.252 − 29 =
  14. 14.105 − 39 =
  15. 15.222 − 38 =
  16. 16.306 − 88 =
  17. 17.309 − 19 =
  18. 18.104 − 46 =
  19. 19.342 − 38 =
  20. 20.503 − 77 =
  21. 21.128 − 26 =
  22. 22.522 − 57 =
  23. 23.72 − 37 =
  24. 24.463 − 99 =
  25. 25.110 − 18 =
  26. 26.184 − 89 =
  27. 27.501 − 66 =
  28. 28.202 − 77 =
  29. 29.287 − 26 =
  30. 30.380 − 98 =
  31. 31.171 − 78 =
  32. 32.466 − 37 =
  33. 33.194 − 26 =
  34. 34.262 − 79 =
  35. 35.244 − 39 =
  36. 36.411 − 46 =
  37. 37.207 − 76 =
  38. 38.485 − 78 =
  39. 39.249 − 87 =
  40. 40.219 − 79 =

Answer key

  1. 117
  2. 505
  3. 275
  4. 261
  5. 95
  6. 32
  7. 385
  8. 167
  9. 259
  10. 87
  11. 37
  12. 196
  13. 223
  14. 66
  15. 184
  16. 218
  17. 290
  18. 58
  19. 304
  20. 426
  21. 102
  22. 465
  23. 35
  24. 364
  25. 92
  26. 95
  27. 435
  28. 125
  29. 261
  30. 282
  31. 93
  32. 429
  33. 168
  34. 183
  35. 205
  36. 365
  37. 131
  38. 407
  39. 162
  40. 140

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