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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 901 · 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. 1.559 − 49 =
  2. 2.396 − 18 =
  3. 3.444 − 57 =
  4. 4.462 − 37 =
  5. 5.554 − 99 =
  6. 6.406 − 98 =
  7. 7.210 − 67 =
  8. 8.209 − 37 =
  9. 9.564 − 19 =
  10. 10.205 − 28 =
  11. 11.141 − 38 =
  12. 12.75 − 57 =
  13. 13.84 − 76 =
  14. 14.158 − 67 =
  15. 15.75 − 36 =
  16. 16.341 − 47 =
  17. 17.210 − 98 =
  18. 18.504 − 96 =
  19. 19.504 − 97 =
  20. 20.160 − 78 =
  21. 21.258 − 16 =
  22. 22.396 − 88 =
  23. 23.436 − 56 =
  24. 24.375 − 48 =
  25. 25.284 − 56 =
  26. 26.543 − 98 =
  27. 27.302 − 96 =
  28. 28.227 − 39 =
  29. 29.183 − 29 =
  30. 30.177 − 98 =
  31. 31.550 − 97 =
  32. 32.189 − 98 =
  33. 33.72 − 58 =
  34. 34.135 − 56 =
  35. 35.340 − 16 =
  36. 36.589 − 68 =
  37. 37.500 − 38 =
  38. 38.311 − 58 =
  39. 39.212 − 66 =
  40. 40.449 − 48 =

Answer key

  1. 510
  2. 378
  3. 387
  4. 425
  5. 455
  6. 308
  7. 143
  8. 172
  9. 545
  10. 177
  11. 103
  12. 18
  13. 8
  14. 91
  15. 39
  16. 294
  17. 112
  18. 408
  19. 407
  20. 82
  21. 242
  22. 308
  23. 380
  24. 327
  25. 228
  26. 445
  27. 206
  28. 188
  29. 154
  30. 79
  31. 453
  32. 91
  33. 14
  34. 79
  35. 324
  36. 521
  37. 462
  38. 253
  39. 146
  40. 401

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