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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 550 · 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. 1.208 − 16 =
  2. 2.167 − 78 =
  3. 3.556 − 77 =
  4. 4.69 − 39 =
  5. 5.449 − 16 =
  6. 6.360 − 58 =
  7. 7.515 − 76 =
  8. 8.175 − 96 =
  9. 9.476 − 19 =
  10. 10.473 − 49 =
  11. 11.402 − 89 =
  12. 12.145 − 39 =
  13. 13.477 − 87 =
  14. 14.306 − 26 =
  15. 15.538 − 98 =
  16. 16.187 − 16 =
  17. 17.300 − 17 =
  18. 18.312 − 46 =
  19. 19.109 − 28 =
  20. 20.344 − 76 =
  21. 21.182 − 86 =
  22. 22.89 − 37 =
  23. 23.76 − 38 =
  24. 24.227 − 77 =
  25. 25.334 − 19 =
  26. 26.485 − 26 =
  27. 27.142 − 57 =
  28. 28.99 − 28 =
  29. 29.238 − 68 =
  30. 30.167 − 88 =
  31. 31.338 − 47 =
  32. 32.358 − 27 =
  33. 33.371 − 37 =
  34. 34.210 − 36 =
  35. 35.289 − 77 =
  36. 36.414 − 58 =
  37. 37.142 − 19 =
  38. 38.233 − 48 =
  39. 39.188 − 96 =
  40. 40.197 − 66 =

Answer key

  1. 192
  2. 89
  3. 479
  4. 30
  5. 433
  6. 302
  7. 439
  8. 79
  9. 457
  10. 424
  11. 313
  12. 106
  13. 390
  14. 280
  15. 440
  16. 171
  17. 283
  18. 266
  19. 81
  20. 268
  21. 96
  22. 52
  23. 38
  24. 150
  25. 315
  26. 459
  27. 85
  28. 71
  29. 170
  30. 79
  31. 291
  32. 331
  33. 334
  34. 174
  35. 212
  36. 356
  37. 123
  38. 185
  39. 92
  40. 131

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