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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 481 · 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. 1.127 − 57 =
  2. 2.148 − 19 =
  3. 3.279 − 19 =
  4. 4.358 − 57 =
  5. 5.420 − 77 =
  6. 6.106 − 18 =
  7. 7.394 − 26 =
  8. 8.75 − 17 =
  9. 9.106 − 18 =
  10. 10.423 − 16 =
  11. 11.178 − 16 =
  12. 12.505 − 66 =
  13. 13.213 − 18 =
  14. 14.494 − 27 =
  15. 15.70 − 38 =
  16. 16.159 − 78 =
  17. 17.412 − 77 =
  18. 18.581 − 96 =
  19. 19.200 − 87 =
  20. 20.306 − 19 =
  21. 21.476 − 17 =
  22. 22.142 − 78 =
  23. 23.215 − 36 =
  24. 24.194 − 36 =
  25. 25.73 − 18 =
  26. 26.143 − 57 =
  27. 27.209 − 48 =
  28. 28.305 − 88 =
  29. 29.295 − 56 =
  30. 30.227 − 47 =
  31. 31.183 − 69 =
  32. 32.258 − 69 =
  33. 33.160 − 16 =
  34. 34.232 − 59 =
  35. 35.141 − 47 =
  36. 36.216 − 36 =
  37. 37.307 − 66 =
  38. 38.108 − 28 =
  39. 39.376 − 87 =
  40. 40.66 − 49 =

Answer key

  1. 70
  2. 129
  3. 260
  4. 301
  5. 343
  6. 88
  7. 368
  8. 58
  9. 88
  10. 407
  11. 162
  12. 439
  13. 195
  14. 467
  15. 32
  16. 81
  17. 335
  18. 485
  19. 113
  20. 287
  21. 459
  22. 64
  23. 179
  24. 158
  25. 55
  26. 86
  27. 161
  28. 217
  29. 239
  30. 180
  31. 114
  32. 189
  33. 144
  34. 173
  35. 94
  36. 180
  37. 241
  38. 80
  39. 289
  40. 17

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