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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 669 · 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. 1.133 − 47 =
  2. 2.310 − 27 =
  3. 3.431 − 58 =
  4. 4.448 − 38 =
  5. 5.391 − 86 =
  6. 6.311 − 69 =
  7. 7.222 − 86 =
  8. 8.318 − 99 =
  9. 9.355 − 57 =
  10. 10.428 − 18 =
  11. 11.152 − 98 =
  12. 12.249 − 69 =
  13. 13.164 − 78 =
  14. 14.551 − 18 =
  15. 15.371 − 98 =
  16. 16.240 − 69 =
  17. 17.216 − 16 =
  18. 18.420 − 78 =
  19. 19.219 − 99 =
  20. 20.91 − 89 =
  21. 21.350 − 76 =
  22. 22.446 − 18 =
  23. 23.110 − 18 =
  24. 24.225 − 86 =
  25. 25.141 − 48 =
  26. 26.564 − 49 =
  27. 27.554 − 78 =
  28. 28.184 − 98 =
  29. 29.535 − 86 =
  30. 30.331 − 38 =
  31. 31.428 − 16 =
  32. 32.159 − 97 =
  33. 33.594 − 37 =
  34. 34.380 − 58 =
  35. 35.542 − 68 =
  36. 36.435 − 28 =
  37. 37.489 − 88 =
  38. 38.498 − 39 =
  39. 39.430 − 97 =
  40. 40.366 − 28 =

Answer key

  1. 86
  2. 283
  3. 373
  4. 410
  5. 305
  6. 242
  7. 136
  8. 219
  9. 298
  10. 410
  11. 54
  12. 180
  13. 86
  14. 533
  15. 273
  16. 171
  17. 200
  18. 342
  19. 120
  20. 2
  21. 274
  22. 428
  23. 92
  24. 139
  25. 93
  26. 515
  27. 476
  28. 86
  29. 449
  30. 293
  31. 412
  32. 62
  33. 557
  34. 322
  35. 474
  36. 407
  37. 401
  38. 459
  39. 333
  40. 338

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