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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 473 · 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. 1.83 + 99 =
  2. 2.401 + 48 =
  3. 3.330 + 27 =
  4. 4.306 + 28 =
  5. 5.406 + 59 =
  6. 6.321 + 97 =
  7. 7.372 + 18 =
  8. 8.289 + 27 =
  9. 9.93 + 98 =
  10. 10.355 + 87 =
  11. 11.193 + 89 =
  12. 12.393 + 18 =
  13. 13.146 + 58 =
  14. 14.127 + 39 =
  15. 15.138 + 48 =
  16. 16.364 + 38 =
  17. 17.322 + 68 =
  18. 18.478 + 18 =
  19. 19.375 + 78 =
  20. 20.29 + 29 =
  21. 21.459 + 49 =
  22. 22.90 + 28 =
  23. 23.70 + 48 =
  24. 24.421 + 27 =
  25. 25.75 + 17 =
  26. 26.396 + 69 =
  27. 27.249 + 97 =
  28. 28.300 + 89 =
  29. 29.160 + 49 =
  30. 30.155 + 57 =
  31. 31.403 + 39 =
  32. 32.248 + 69 =
  33. 33.471 + 28 =
  34. 34.279 + 18 =
  35. 35.250 + 17 =
  36. 36.434 + 19 =
  37. 37.62 + 88 =
  38. 38.168 + 98 =
  39. 39.51 + 69 =
  40. 40.28 + 68 =

Answer key

  1. 182
  2. 449
  3. 357
  4. 334
  5. 465
  6. 418
  7. 390
  8. 316
  9. 191
  10. 442
  11. 282
  12. 411
  13. 204
  14. 166
  15. 186
  16. 402
  17. 390
  18. 496
  19. 453
  20. 58
  21. 508
  22. 118
  23. 118
  24. 448
  25. 92
  26. 465
  27. 346
  28. 389
  29. 209
  30. 212
  31. 442
  32. 317
  33. 499
  34. 297
  35. 267
  36. 453
  37. 150
  38. 266
  39. 120
  40. 96

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