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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 340 · 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. 1.521 − 17 =
  2. 2.223 − 29 =
  3. 3.192 − 87 =
  4. 4.452 − 26 =
  5. 5.378 − 78 =
  6. 6.338 − 38 =
  7. 7.494 − 29 =
  8. 8.418 − 66 =
  9. 9.161 − 37 =
  10. 10.200 − 46 =
  11. 11.379 − 16 =
  12. 12.270 − 28 =
  13. 13.349 − 37 =
  14. 14.515 − 98 =
  15. 15.338 − 56 =
  16. 16.109 − 78 =
  17. 17.206 − 67 =
  18. 18.166 − 98 =
  19. 19.326 − 17 =
  20. 20.166 − 49 =
  21. 21.171 − 29 =
  22. 22.347 − 78 =
  23. 23.217 − 27 =
  24. 24.217 − 46 =
  25. 25.134 − 26 =
  26. 26.347 − 87 =
  27. 27.576 − 89 =
  28. 28.257 − 77 =
  29. 29.137 − 87 =
  30. 30.236 − 57 =
  31. 31.98 − 56 =
  32. 32.52 − 38 =
  33. 33.143 − 66 =
  34. 34.148 − 39 =
  35. 35.99 − 87 =
  36. 36.313 − 37 =
  37. 37.436 − 29 =
  38. 38.177 − 17 =
  39. 39.465 − 79 =
  40. 40.201 − 79 =

Answer key

  1. 504
  2. 194
  3. 105
  4. 426
  5. 300
  6. 300
  7. 465
  8. 352
  9. 124
  10. 154
  11. 363
  12. 242
  13. 312
  14. 417
  15. 282
  16. 31
  17. 139
  18. 68
  19. 309
  20. 117
  21. 142
  22. 269
  23. 190
  24. 171
  25. 108
  26. 260
  27. 487
  28. 180
  29. 50
  30. 179
  31. 42
  32. 14
  33. 77
  34. 109
  35. 12
  36. 276
  37. 407
  38. 160
  39. 386
  40. 122

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