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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 189 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.482 + 58 =
  2. 2.78 + 69 =
  3. 3.441 + 58 =
  4. 4.40 + 87 =
  5. 5.40 + 47 =
  6. 6.25 + 48 =
  7. 7.370 + 89 =
  8. 8.421 + 78 =
  9. 9.479 + 87 =
  10. 10.161 + 47 =
  11. 11.243 + 57 =
  12. 12.425 + 17 =
  13. 13.387 + 17 =
  14. 14.51 + 69 =
  15. 15.102 + 39 =
  16. 16.352 + 49 =
  17. 17.307 + 97 =
  18. 18.108 + 37 =
  19. 19.153 + 17 =
  20. 20.245 + 17 =
  21. 21.64 + 89 =
  22. 22.228 + 29 =
  23. 23.326 + 69 =
  24. 24.397 + 59 =
  25. 25.458 + 68 =
  26. 26.211 + 58 =
  27. 27.107 + 48 =
  28. 28.156 + 27 =
  29. 29.418 + 69 =
  30. 30.301 + 17 =
  31. 31.25 + 18 =
  32. 32.302 + 17 =
  33. 33.103 + 67 =
  34. 34.77 + 29 =
  35. 35.253 + 49 =
  36. 36.85 + 17 =
  37. 37.499 + 88 =
  38. 38.396 + 48 =
  39. 39.317 + 38 =
  40. 40.238 + 27 =

Answer key

  1. 540
  2. 147
  3. 499
  4. 127
  5. 87
  6. 73
  7. 459
  8. 499
  9. 566
  10. 208
  11. 300
  12. 442
  13. 404
  14. 120
  15. 141
  16. 401
  17. 404
  18. 145
  19. 170
  20. 262
  21. 153
  22. 257
  23. 395
  24. 456
  25. 526
  26. 269
  27. 155
  28. 183
  29. 487
  30. 318
  31. 43
  32. 319
  33. 170
  34. 106
  35. 302
  36. 102
  37. 587
  38. 444
  39. 355
  40. 265

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