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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 409 · 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. 1.214 − 86 =
  2. 2.277 − 16 =
  3. 3.280 − 17 =
  4. 4.515 − 56 =
  5. 5.60 − 59 =
  6. 6.343 − 97 =
  7. 7.469 − 39 =
  8. 8.319 − 47 =
  9. 9.407 − 59 =
  10. 10.532 − 37 =
  11. 11.181 − 89 =
  12. 12.461 − 38 =
  13. 13.170 − 57 =
  14. 14.404 − 89 =
  15. 15.265 − 99 =
  16. 16.331 − 26 =
  17. 17.167 − 37 =
  18. 18.148 − 46 =
  19. 19.346 − 99 =
  20. 20.576 − 39 =
  21. 21.209 − 47 =
  22. 22.178 − 87 =
  23. 23.175 − 48 =
  24. 24.95 − 77 =
  25. 25.208 − 97 =
  26. 26.260 − 66 =
  27. 27.420 − 97 =
  28. 28.148 − 26 =
  29. 29.158 − 98 =
  30. 30.75 − 16 =
  31. 31.324 − 66 =
  32. 32.143 − 28 =
  33. 33.175 − 57 =
  34. 34.443 − 78 =
  35. 35.132 − 86 =
  36. 36.266 − 38 =
  37. 37.446 − 77 =
  38. 38.490 − 58 =
  39. 39.103 − 66 =
  40. 40.90 − 29 =

Answer key

  1. 128
  2. 261
  3. 263
  4. 459
  5. 1
  6. 246
  7. 430
  8. 272
  9. 348
  10. 495
  11. 92
  12. 423
  13. 113
  14. 315
  15. 166
  16. 305
  17. 130
  18. 102
  19. 247
  20. 537
  21. 162
  22. 91
  23. 127
  24. 18
  25. 111
  26. 194
  27. 323
  28. 122
  29. 60
  30. 59
  31. 258
  32. 115
  33. 118
  34. 365
  35. 46
  36. 228
  37. 369
  38. 432
  39. 37
  40. 61

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