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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 526 · 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. 1.463 + 99 =
  2. 2.248 + 68 =
  3. 3.379 + 68 =
  4. 4.200 + 19 =
  5. 5.33 + 37 =
  6. 6.47 + 17 =
  7. 7.163 + 68 =
  8. 8.72 + 39 =
  9. 9.385 + 27 =
  10. 10.486 + 69 =
  11. 11.53 + 57 =
  12. 12.125 + 29 =
  13. 13.477 + 37 =
  14. 14.219 + 37 =
  15. 15.433 + 67 =
  16. 16.496 + 68 =
  17. 17.112 + 78 =
  18. 18.369 + 79 =
  19. 19.379 + 87 =
  20. 20.370 + 19 =
  21. 21.192 + 98 =
  22. 22.387 + 39 =
  23. 23.412 + 27 =
  24. 24.345 + 68 =
  25. 25.297 + 29 =
  26. 26.165 + 88 =
  27. 27.482 + 87 =
  28. 28.207 + 97 =
  29. 29.172 + 49 =
  30. 30.424 + 18 =
  31. 31.160 + 38 =
  32. 32.206 + 17 =
  33. 33.137 + 57 =
  34. 34.469 + 28 =
  35. 35.131 + 78 =
  36. 36.471 + 59 =
  37. 37.41 + 69 =
  38. 38.295 + 97 =
  39. 39.28 + 77 =
  40. 40.37 + 78 =

Answer key

  1. 562
  2. 316
  3. 447
  4. 219
  5. 70
  6. 64
  7. 231
  8. 111
  9. 412
  10. 555
  11. 110
  12. 154
  13. 514
  14. 256
  15. 500
  16. 564
  17. 190
  18. 448
  19. 466
  20. 389
  21. 290
  22. 426
  23. 439
  24. 413
  25. 326
  26. 253
  27. 569
  28. 304
  29. 221
  30. 442
  31. 198
  32. 223
  33. 194
  34. 497
  35. 209
  36. 530
  37. 110
  38. 392
  39. 105
  40. 115

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