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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 938 · 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. 1.264 − 69 =
  2. 2.136 − 79 =
  3. 3.83 − 66 =
  4. 4.97 − 46 =
  5. 5.255 − 97 =
  6. 6.563 − 19 =
  7. 7.166 − 39 =
  8. 8.122 − 29 =
  9. 9.352 − 28 =
  10. 10.111 − 87 =
  11. 11.350 − 88 =
  12. 12.110 − 48 =
  13. 13.174 − 69 =
  14. 14.404 − 37 =
  15. 15.231 − 86 =
  16. 16.139 − 16 =
  17. 17.99 − 47 =
  18. 18.351 − 79 =
  19. 19.293 − 48 =
  20. 20.176 − 86 =
  21. 21.537 − 86 =
  22. 22.255 − 18 =
  23. 23.478 − 47 =
  24. 24.62 − 48 =
  25. 25.357 − 86 =
  26. 26.434 − 18 =
  27. 27.92 − 77 =
  28. 28.592 − 36 =
  29. 29.67 − 38 =
  30. 30.449 − 59 =
  31. 31.443 − 18 =
  32. 32.224 − 86 =
  33. 33.90 − 68 =
  34. 34.93 − 16 =
  35. 35.165 − 17 =
  36. 36.86 − 39 =
  37. 37.188 − 77 =
  38. 38.234 − 76 =
  39. 39.191 − 67 =
  40. 40.406 − 98 =

Answer key

  1. 195
  2. 57
  3. 17
  4. 51
  5. 158
  6. 544
  7. 127
  8. 93
  9. 324
  10. 24
  11. 262
  12. 62
  13. 105
  14. 367
  15. 145
  16. 123
  17. 52
  18. 272
  19. 245
  20. 90
  21. 451
  22. 237
  23. 431
  24. 14
  25. 271
  26. 416
  27. 15
  28. 556
  29. 29
  30. 390
  31. 425
  32. 138
  33. 22
  34. 77
  35. 148
  36. 47
  37. 111
  38. 158
  39. 124
  40. 308

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