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Subtraction Trick Worksheet

Speed calculation lesson 3: Same-change subtraction · Set 37 · 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. 1.80 − 79 =
  2. 2.322 − 99 =
  3. 3.132 − 19 =
  4. 4.106 − 77 =
  5. 5.425 − 18 =
  6. 6.73 − 57 =
  7. 7.540 − 47 =
  8. 8.149 − 16 =
  9. 9.314 − 26 =
  10. 10.424 − 96 =
  11. 11.143 − 37 =
  12. 12.504 − 68 =
  13. 13.448 − 36 =
  14. 14.583 − 39 =
  15. 15.464 − 79 =
  16. 16.588 − 28 =
  17. 17.426 − 29 =
  18. 18.95 − 37 =
  19. 19.102 − 69 =
  20. 20.452 − 19 =
  21. 21.132 − 97 =
  22. 22.280 − 47 =
  23. 23.214 − 98 =
  24. 24.339 − 29 =
  25. 25.206 − 38 =
  26. 26.228 − 19 =
  27. 27.139 − 49 =
  28. 28.72 − 46 =
  29. 29.494 − 39 =
  30. 30.322 − 29 =
  31. 31.169 − 46 =
  32. 32.566 − 49 =
  33. 33.448 − 37 =
  34. 34.161 − 76 =
  35. 35.163 − 56 =
  36. 36.208 − 16 =
  37. 37.314 − 59 =
  38. 38.241 − 77 =
  39. 39.186 − 39 =
  40. 40.329 − 58 =

Answer key

  1. 1
  2. 223
  3. 113
  4. 29
  5. 407
  6. 16
  7. 493
  8. 133
  9. 288
  10. 328
  11. 106
  12. 436
  13. 412
  14. 544
  15. 385
  16. 560
  17. 397
  18. 58
  19. 33
  20. 433
  21. 35
  22. 233
  23. 116
  24. 310
  25. 168
  26. 209
  27. 90
  28. 26
  29. 455
  30. 293
  31. 123
  32. 517
  33. 411
  34. 85
  35. 107
  36. 192
  37. 255
  38. 164
  39. 147
  40. 271

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