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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 623 · 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. 1.147 − 37 =
  2. 2.333 − 16 =
  3. 3.406 − 17 =
  4. 4.171 − 38 =
  5. 5.301 − 56 =
  6. 6.155 − 89 =
  7. 7.207 − 56 =
  8. 8.394 − 17 =
  9. 9.326 − 17 =
  10. 10.555 − 79 =
  11. 11.561 − 49 =
  12. 12.189 − 98 =
  13. 13.552 − 96 =
  14. 14.191 − 66 =
  15. 15.99 − 86 =
  16. 16.348 − 19 =
  17. 17.276 − 17 =
  18. 18.156 − 17 =
  19. 19.153 − 76 =
  20. 20.130 − 97 =
  21. 21.479 − 18 =
  22. 22.528 − 69 =
  23. 23.73 − 27 =
  24. 24.394 − 27 =
  25. 25.550 − 58 =
  26. 26.159 − 49 =
  27. 27.173 − 76 =
  28. 28.362 − 77 =
  29. 29.238 − 87 =
  30. 30.386 − 48 =
  31. 31.198 − 89 =
  32. 32.91 − 17 =
  33. 33.441 − 17 =
  34. 34.169 − 76 =
  35. 35.484 − 87 =
  36. 36.73 − 67 =
  37. 37.317 − 79 =
  38. 38.242 − 78 =
  39. 39.317 − 56 =
  40. 40.93 − 89 =

Answer key

  1. 110
  2. 317
  3. 389
  4. 133
  5. 245
  6. 66
  7. 151
  8. 377
  9. 309
  10. 476
  11. 512
  12. 91
  13. 456
  14. 125
  15. 13
  16. 329
  17. 259
  18. 139
  19. 77
  20. 33
  21. 461
  22. 459
  23. 46
  24. 367
  25. 492
  26. 110
  27. 97
  28. 285
  29. 151
  30. 338
  31. 109
  32. 74
  33. 424
  34. 93
  35. 397
  36. 6
  37. 238
  38. 164
  39. 261
  40. 4

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