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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 677 · 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. 1.90 + 89 =
  2. 2.419 + 69 =
  3. 3.469 + 59 =
  4. 4.352 + 17 =
  5. 5.334 + 18 =
  6. 6.162 + 78 =
  7. 7.384 + 48 =
  8. 8.465 + 69 =
  9. 9.446 + 47 =
  10. 10.252 + 67 =
  11. 11.414 + 69 =
  12. 12.449 + 89 =
  13. 13.425 + 47 =
  14. 14.117 + 98 =
  15. 15.283 + 98 =
  16. 16.268 + 98 =
  17. 17.197 + 49 =
  18. 18.425 + 89 =
  19. 19.270 + 78 =
  20. 20.229 + 67 =
  21. 21.79 + 78 =
  22. 22.280 + 19 =
  23. 23.411 + 19 =
  24. 24.59 + 57 =
  25. 25.428 + 48 =
  26. 26.348 + 47 =
  27. 27.357 + 67 =
  28. 28.50 + 57 =
  29. 29.143 + 68 =
  30. 30.213 + 47 =
  31. 31.69 + 29 =
  32. 32.275 + 77 =
  33. 33.414 + 39 =
  34. 34.211 + 27 =
  35. 35.117 + 58 =
  36. 36.248 + 69 =
  37. 37.385 + 57 =
  38. 38.260 + 37 =
  39. 39.140 + 47 =
  40. 40.269 + 29 =

Answer key

  1. 179
  2. 488
  3. 528
  4. 369
  5. 352
  6. 240
  7. 432
  8. 534
  9. 493
  10. 319
  11. 483
  12. 538
  13. 472
  14. 215
  15. 381
  16. 366
  17. 246
  18. 514
  19. 348
  20. 296
  21. 157
  22. 299
  23. 430
  24. 116
  25. 476
  26. 395
  27. 424
  28. 107
  29. 211
  30. 260
  31. 98
  32. 352
  33. 453
  34. 238
  35. 175
  36. 317
  37. 442
  38. 297
  39. 187
  40. 298

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