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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 644 · 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. 1.245 − 36 =
  2. 2.212 − 49 =
  3. 3.167 − 58 =
  4. 4.242 − 59 =
  5. 5.316 − 17 =
  6. 6.343 − 17 =
  7. 7.127 − 16 =
  8. 8.530 − 29 =
  9. 9.59 − 57 =
  10. 10.500 − 89 =
  11. 11.550 − 68 =
  12. 12.565 − 56 =
  13. 13.158 − 17 =
  14. 14.376 − 58 =
  15. 15.527 − 99 =
  16. 16.63 − 29 =
  17. 17.595 − 46 =
  18. 18.52 − 36 =
  19. 19.234 − 56 =
  20. 20.216 − 17 =
  21. 21.283 − 86 =
  22. 22.108 − 87 =
  23. 23.291 − 16 =
  24. 24.499 − 66 =
  25. 25.67 − 58 =
  26. 26.275 − 68 =
  27. 27.174 − 17 =
  28. 28.445 − 39 =
  29. 29.341 − 87 =
  30. 30.116 − 49 =
  31. 31.141 − 69 =
  32. 32.141 − 98 =
  33. 33.186 − 97 =
  34. 34.523 − 67 =
  35. 35.518 − 76 =
  36. 36.101 − 46 =
  37. 37.249 − 56 =
  38. 38.280 − 67 =
  39. 39.218 − 47 =
  40. 40.113 − 49 =

Answer key

  1. 209
  2. 163
  3. 109
  4. 183
  5. 299
  6. 326
  7. 111
  8. 501
  9. 2
  10. 411
  11. 482
  12. 509
  13. 141
  14. 318
  15. 428
  16. 34
  17. 549
  18. 16
  19. 178
  20. 199
  21. 197
  22. 21
  23. 275
  24. 433
  25. 9
  26. 207
  27. 157
  28. 406
  29. 254
  30. 67
  31. 72
  32. 43
  33. 89
  34. 456
  35. 442
  36. 55
  37. 193
  38. 213
  39. 171
  40. 64

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