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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 851 · 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. 1.135 − 49 =
  2. 2.164 − 17 =
  3. 3.154 − 89 =
  4. 4.209 − 26 =
  5. 5.144 − 86 =
  6. 6.381 − 66 =
  7. 7.475 − 58 =
  8. 8.60 − 17 =
  9. 9.360 − 79 =
  10. 10.318 − 66 =
  11. 11.130 − 88 =
  12. 12.292 − 87 =
  13. 13.356 − 27 =
  14. 14.154 − 49 =
  15. 15.244 − 46 =
  16. 16.323 − 97 =
  17. 17.273 − 99 =
  18. 18.273 − 96 =
  19. 19.390 − 26 =
  20. 20.460 − 37 =
  21. 21.140 − 67 =
  22. 22.554 − 16 =
  23. 23.407 − 78 =
  24. 24.394 − 66 =
  25. 25.523 − 37 =
  26. 26.230 − 29 =
  27. 27.184 − 88 =
  28. 28.521 − 78 =
  29. 29.352 − 87 =
  30. 30.447 − 47 =
  31. 31.258 − 37 =
  32. 32.378 − 37 =
  33. 33.399 − 27 =
  34. 34.503 − 86 =
  35. 35.198 − 36 =
  36. 36.476 − 59 =
  37. 37.101 − 69 =
  38. 38.483 − 27 =
  39. 39.518 − 56 =
  40. 40.329 − 78 =

Answer key

  1. 86
  2. 147
  3. 65
  4. 183
  5. 58
  6. 315
  7. 417
  8. 43
  9. 281
  10. 252
  11. 42
  12. 205
  13. 329
  14. 105
  15. 198
  16. 226
  17. 174
  18. 177
  19. 364
  20. 423
  21. 73
  22. 538
  23. 329
  24. 328
  25. 486
  26. 201
  27. 96
  28. 443
  29. 265
  30. 400
  31. 221
  32. 341
  33. 372
  34. 417
  35. 162
  36. 417
  37. 32
  38. 456
  39. 462
  40. 251

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