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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 352 · 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. 1.142 + 48 =
  2. 2.439 + 87 =
  3. 3.376 + 58 =
  4. 4.176 + 88 =
  5. 5.278 + 38 =
  6. 6.285 + 37 =
  7. 7.323 + 98 =
  8. 8.311 + 67 =
  9. 9.29 + 38 =
  10. 10.450 + 98 =
  11. 11.321 + 27 =
  12. 12.135 + 88 =
  13. 13.463 + 97 =
  14. 14.254 + 38 =
  15. 15.275 + 79 =
  16. 16.463 + 77 =
  17. 17.347 + 57 =
  18. 18.157 + 38 =
  19. 19.316 + 58 =
  20. 20.481 + 87 =
  21. 21.48 + 27 =
  22. 22.413 + 67 =
  23. 23.83 + 67 =
  24. 24.189 + 97 =
  25. 25.107 + 38 =
  26. 26.134 + 98 =
  27. 27.175 + 38 =
  28. 28.439 + 18 =
  29. 29.91 + 39 =
  30. 30.63 + 27 =
  31. 31.272 + 18 =
  32. 32.65 + 47 =
  33. 33.429 + 47 =
  34. 34.151 + 18 =
  35. 35.200 + 39 =
  36. 36.203 + 57 =
  37. 37.288 + 67 =
  38. 38.246 + 98 =
  39. 39.221 + 78 =
  40. 40.348 + 69 =

Answer key

  1. 190
  2. 526
  3. 434
  4. 264
  5. 316
  6. 322
  7. 421
  8. 378
  9. 67
  10. 548
  11. 348
  12. 223
  13. 560
  14. 292
  15. 354
  16. 540
  17. 404
  18. 195
  19. 374
  20. 568
  21. 75
  22. 480
  23. 150
  24. 286
  25. 145
  26. 232
  27. 213
  28. 457
  29. 130
  30. 90
  31. 290
  32. 112
  33. 476
  34. 169
  35. 239
  36. 260
  37. 355
  38. 344
  39. 299
  40. 417

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