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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 24 · 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. 1.100 + 58 =
  2. 2.139 + 79 =
  3. 3.168 + 67 =
  4. 4.267 + 69 =
  5. 5.206 + 67 =
  6. 6.76 + 98 =
  7. 7.252 + 99 =
  8. 8.246 + 38 =
  9. 9.77 + 67 =
  10. 10.103 + 87 =
  11. 11.115 + 28 =
  12. 12.42 + 78 =
  13. 13.415 + 27 =
  14. 14.61 + 97 =
  15. 15.35 + 89 =
  16. 16.46 + 17 =
  17. 17.410 + 77 =
  18. 18.102 + 87 =
  19. 19.374 + 67 =
  20. 20.125 + 77 =
  21. 21.100 + 49 =
  22. 22.240 + 19 =
  23. 23.360 + 39 =
  24. 24.30 + 67 =
  25. 25.387 + 28 =
  26. 26.41 + 19 =
  27. 27.205 + 57 =
  28. 28.418 + 68 =
  29. 29.490 + 58 =
  30. 30.419 + 77 =
  31. 31.389 + 37 =
  32. 32.62 + 97 =
  33. 33.82 + 27 =
  34. 34.245 + 58 =
  35. 35.275 + 87 =
  36. 36.140 + 39 =
  37. 37.35 + 39 =
  38. 38.42 + 69 =
  39. 39.204 + 57 =
  40. 40.70 + 99 =

Answer key

  1. 158
  2. 218
  3. 235
  4. 336
  5. 273
  6. 174
  7. 351
  8. 284
  9. 144
  10. 190
  11. 143
  12. 120
  13. 442
  14. 158
  15. 124
  16. 63
  17. 487
  18. 189
  19. 441
  20. 202
  21. 149
  22. 259
  23. 399
  24. 97
  25. 415
  26. 60
  27. 262
  28. 486
  29. 548
  30. 496
  31. 426
  32. 159
  33. 109
  34. 303
  35. 362
  36. 179
  37. 74
  38. 111
  39. 261
  40. 169

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