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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 96 · 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. 1.157 + 18 =
  2. 2.464 + 37 =
  3. 3.234 + 38 =
  4. 4.329 + 29 =
  5. 5.385 + 78 =
  6. 6.135 + 49 =
  7. 7.58 + 98 =
  8. 8.448 + 38 =
  9. 9.496 + 49 =
  10. 10.133 + 47 =
  11. 11.135 + 69 =
  12. 12.60 + 87 =
  13. 13.30 + 27 =
  14. 14.172 + 29 =
  15. 15.96 + 78 =
  16. 16.97 + 69 =
  17. 17.171 + 59 =
  18. 18.206 + 57 =
  19. 19.77 + 27 =
  20. 20.30 + 49 =
  21. 21.236 + 28 =
  22. 22.333 + 29 =
  23. 23.452 + 57 =
  24. 24.108 + 28 =
  25. 25.71 + 57 =
  26. 26.208 + 19 =
  27. 27.375 + 57 =
  28. 28.311 + 49 =
  29. 29.64 + 39 =
  30. 30.446 + 37 =
  31. 31.53 + 57 =
  32. 32.468 + 97 =
  33. 33.247 + 57 =
  34. 34.146 + 48 =
  35. 35.54 + 37 =
  36. 36.247 + 89 =
  37. 37.425 + 47 =
  38. 38.434 + 67 =
  39. 39.409 + 49 =
  40. 40.309 + 67 =

Answer key

  1. 175
  2. 501
  3. 272
  4. 358
  5. 463
  6. 184
  7. 156
  8. 486
  9. 545
  10. 180
  11. 204
  12. 147
  13. 57
  14. 201
  15. 174
  16. 166
  17. 230
  18. 263
  19. 104
  20. 79
  21. 264
  22. 362
  23. 509
  24. 136
  25. 128
  26. 227
  27. 432
  28. 360
  29. 103
  30. 483
  31. 110
  32. 565
  33. 304
  34. 194
  35. 91
  36. 336
  37. 472
  38. 501
  39. 458
  40. 376

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