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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 994 · 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. 1.88 − 29 =
  2. 2.144 − 88 =
  3. 3.193 − 49 =
  4. 4.250 − 27 =
  5. 5.354 − 97 =
  6. 6.301 − 19 =
  7. 7.335 − 99 =
  8. 8.127 − 88 =
  9. 9.467 − 27 =
  10. 10.431 − 16 =
  11. 11.456 − 47 =
  12. 12.102 − 98 =
  13. 13.324 − 68 =
  14. 14.307 − 36 =
  15. 15.298 − 48 =
  16. 16.205 − 88 =
  17. 17.269 − 96 =
  18. 18.428 − 17 =
  19. 19.490 − 87 =
  20. 20.348 − 48 =
  21. 21.140 − 67 =
  22. 22.129 − 28 =
  23. 23.160 − 99 =
  24. 24.129 − 57 =
  25. 25.536 − 46 =
  26. 26.350 − 77 =
  27. 27.239 − 68 =
  28. 28.162 − 17 =
  29. 29.477 − 36 =
  30. 30.181 − 37 =
  31. 31.164 − 98 =
  32. 32.599 − 18 =
  33. 33.186 − 69 =
  34. 34.281 − 46 =
  35. 35.307 − 76 =
  36. 36.170 − 97 =
  37. 37.108 − 36 =
  38. 38.410 − 66 =
  39. 39.244 − 87 =
  40. 40.540 − 37 =

Answer key

  1. 59
  2. 56
  3. 144
  4. 223
  5. 257
  6. 282
  7. 236
  8. 39
  9. 440
  10. 415
  11. 409
  12. 4
  13. 256
  14. 271
  15. 250
  16. 117
  17. 173
  18. 411
  19. 403
  20. 300
  21. 73
  22. 101
  23. 61
  24. 72
  25. 490
  26. 273
  27. 171
  28. 145
  29. 441
  30. 144
  31. 66
  32. 581
  33. 117
  34. 235
  35. 231
  36. 73
  37. 72
  38. 344
  39. 157
  40. 503

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