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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 102 · 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. 1.197 − 96 =
  2. 2.381 − 76 =
  3. 3.65 − 47 =
  4. 4.165 − 48 =
  5. 5.298 − 59 =
  6. 6.122 − 18 =
  7. 7.98 − 77 =
  8. 8.380 − 28 =
  9. 9.435 − 56 =
  10. 10.413 − 26 =
  11. 11.304 − 87 =
  12. 12.390 − 99 =
  13. 13.334 − 78 =
  14. 14.54 − 46 =
  15. 15.532 − 37 =
  16. 16.121 − 16 =
  17. 17.145 − 76 =
  18. 18.567 − 26 =
  19. 19.399 − 87 =
  20. 20.409 − 29 =
  21. 21.593 − 86 =
  22. 22.190 − 98 =
  23. 23.183 − 96 =
  24. 24.137 − 46 =
  25. 25.581 − 68 =
  26. 26.254 − 68 =
  27. 27.177 − 96 =
  28. 28.281 − 39 =
  29. 29.182 − 99 =
  30. 30.504 − 36 =
  31. 31.323 − 89 =
  32. 32.228 − 58 =
  33. 33.112 − 37 =
  34. 34.191 − 98 =
  35. 35.371 − 68 =
  36. 36.416 − 97 =
  37. 37.240 − 56 =
  38. 38.434 − 68 =
  39. 39.193 − 36 =
  40. 40.170 − 97 =

Answer key

  1. 101
  2. 305
  3. 18
  4. 117
  5. 239
  6. 104
  7. 21
  8. 352
  9. 379
  10. 387
  11. 217
  12. 291
  13. 256
  14. 8
  15. 495
  16. 105
  17. 69
  18. 541
  19. 312
  20. 380
  21. 507
  22. 92
  23. 87
  24. 91
  25. 513
  26. 186
  27. 81
  28. 242
  29. 83
  30. 468
  31. 234
  32. 170
  33. 75
  34. 93
  35. 303
  36. 319
  37. 184
  38. 366
  39. 157
  40. 73

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