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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 778 · 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. 1.276 + 59 =
  2. 2.496 + 99 =
  3. 3.221 + 37 =
  4. 4.156 + 87 =
  5. 5.330 + 18 =
  6. 6.59 + 78 =
  7. 7.171 + 38 =
  8. 8.258 + 29 =
  9. 9.399 + 89 =
  10. 10.153 + 97 =
  11. 11.39 + 57 =
  12. 12.495 + 89 =
  13. 13.272 + 87 =
  14. 14.418 + 39 =
  15. 15.69 + 69 =
  16. 16.450 + 27 =
  17. 17.467 + 77 =
  18. 18.81 + 97 =
  19. 19.48 + 29 =
  20. 20.89 + 98 =
  21. 21.385 + 97 =
  22. 22.249 + 29 =
  23. 23.207 + 68 =
  24. 24.293 + 39 =
  25. 25.375 + 98 =
  26. 26.335 + 19 =
  27. 27.463 + 78 =
  28. 28.315 + 69 =
  29. 29.325 + 39 =
  30. 30.446 + 97 =
  31. 31.372 + 58 =
  32. 32.119 + 39 =
  33. 33.158 + 99 =
  34. 34.240 + 97 =
  35. 35.122 + 77 =
  36. 36.433 + 87 =
  37. 37.284 + 78 =
  38. 38.102 + 37 =
  39. 39.69 + 38 =
  40. 40.346 + 87 =

Answer key

  1. 335
  2. 595
  3. 258
  4. 243
  5. 348
  6. 137
  7. 209
  8. 287
  9. 488
  10. 250
  11. 96
  12. 584
  13. 359
  14. 457
  15. 138
  16. 477
  17. 544
  18. 178
  19. 77
  20. 187
  21. 482
  22. 278
  23. 275
  24. 332
  25. 473
  26. 354
  27. 541
  28. 384
  29. 364
  30. 543
  31. 430
  32. 158
  33. 257
  34. 337
  35. 199
  36. 520
  37. 362
  38. 139
  39. 107
  40. 433

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