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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 854 · 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. 1.520 − 29 =
  2. 2.205 − 16 =
  3. 3.328 − 17 =
  4. 4.371 − 26 =
  5. 5.56 − 19 =
  6. 6.301 − 76 =
  7. 7.456 − 88 =
  8. 8.135 − 28 =
  9. 9.531 − 59 =
  10. 10.378 − 68 =
  11. 11.304 − 67 =
  12. 12.99 − 26 =
  13. 13.317 − 47 =
  14. 14.161 − 99 =
  15. 15.568 − 49 =
  16. 16.81 − 46 =
  17. 17.278 − 26 =
  18. 18.450 − 38 =
  19. 19.238 − 38 =
  20. 20.153 − 98 =
  21. 21.170 − 66 =
  22. 22.460 − 57 =
  23. 23.472 − 47 =
  24. 24.335 − 87 =
  25. 25.314 − 16 =
  26. 26.113 − 17 =
  27. 27.421 − 26 =
  28. 28.162 − 98 =
  29. 29.481 − 97 =
  30. 30.441 − 59 =
  31. 31.280 − 28 =
  32. 32.239 − 16 =
  33. 33.456 − 78 =
  34. 34.165 − 28 =
  35. 35.545 − 97 =
  36. 36.114 − 76 =
  37. 37.564 − 78 =
  38. 38.64 − 57 =
  39. 39.205 − 97 =
  40. 40.111 − 68 =

Answer key

  1. 491
  2. 189
  3. 311
  4. 345
  5. 37
  6. 225
  7. 368
  8. 107
  9. 472
  10. 310
  11. 237
  12. 73
  13. 270
  14. 62
  15. 519
  16. 35
  17. 252
  18. 412
  19. 200
  20. 55
  21. 104
  22. 403
  23. 425
  24. 248
  25. 298
  26. 96
  27. 395
  28. 64
  29. 384
  30. 382
  31. 252
  32. 223
  33. 378
  34. 137
  35. 448
  36. 38
  37. 486
  38. 7
  39. 108
  40. 43

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