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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 451 · 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. 1.251 − 16 =
  2. 2.385 − 87 =
  3. 3.193 − 16 =
  4. 4.174 − 98 =
  5. 5.411 − 99 =
  6. 6.543 − 66 =
  7. 7.175 − 48 =
  8. 8.145 − 59 =
  9. 9.165 − 38 =
  10. 10.433 − 36 =
  11. 11.538 − 86 =
  12. 12.219 − 29 =
  13. 13.199 − 26 =
  14. 14.98 − 96 =
  15. 15.193 − 99 =
  16. 16.73 − 67 =
  17. 17.108 − 36 =
  18. 18.237 − 67 =
  19. 19.179 − 47 =
  20. 20.210 − 27 =
  21. 21.352 − 96 =
  22. 22.433 − 67 =
  23. 23.53 − 28 =
  24. 24.316 − 18 =
  25. 25.72 − 56 =
  26. 26.416 − 16 =
  27. 27.123 − 46 =
  28. 28.200 − 28 =
  29. 29.159 − 97 =
  30. 30.142 − 59 =
  31. 31.369 − 48 =
  32. 32.481 − 98 =
  33. 33.512 − 66 =
  34. 34.116 − 79 =
  35. 35.444 − 66 =
  36. 36.538 − 76 =
  37. 37.383 − 17 =
  38. 38.188 − 88 =
  39. 39.61 − 17 =
  40. 40.238 − 36 =

Answer key

  1. 235
  2. 298
  3. 177
  4. 76
  5. 312
  6. 477
  7. 127
  8. 86
  9. 127
  10. 397
  11. 452
  12. 190
  13. 173
  14. 2
  15. 94
  16. 6
  17. 72
  18. 170
  19. 132
  20. 183
  21. 256
  22. 366
  23. 25
  24. 298
  25. 16
  26. 400
  27. 77
  28. 172
  29. 62
  30. 83
  31. 321
  32. 383
  33. 446
  34. 37
  35. 378
  36. 462
  37. 366
  38. 100
  39. 44
  40. 202

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