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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 442 · 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. 1.307 + 79 =
  2. 2.322 + 59 =
  3. 3.145 + 69 =
  4. 4.321 + 69 =
  5. 5.373 + 68 =
  6. 6.302 + 28 =
  7. 7.159 + 38 =
  8. 8.191 + 27 =
  9. 9.131 + 57 =
  10. 10.395 + 67 =
  11. 11.387 + 37 =
  12. 12.160 + 48 =
  13. 13.366 + 58 =
  14. 14.38 + 18 =
  15. 15.358 + 79 =
  16. 16.484 + 99 =
  17. 17.387 + 37 =
  18. 18.371 + 58 =
  19. 19.49 + 19 =
  20. 20.67 + 19 =
  21. 21.166 + 87 =
  22. 22.269 + 17 =
  23. 23.303 + 59 =
  24. 24.431 + 39 =
  25. 25.214 + 89 =
  26. 26.41 + 37 =
  27. 27.492 + 57 =
  28. 28.230 + 97 =
  29. 29.346 + 28 =
  30. 30.433 + 98 =
  31. 31.125 + 98 =
  32. 32.77 + 47 =
  33. 33.62 + 98 =
  34. 34.370 + 88 =
  35. 35.337 + 67 =
  36. 36.443 + 98 =
  37. 37.159 + 47 =
  38. 38.243 + 18 =
  39. 39.161 + 39 =
  40. 40.209 + 98 =

Answer key

  1. 386
  2. 381
  3. 214
  4. 390
  5. 441
  6. 330
  7. 197
  8. 218
  9. 188
  10. 462
  11. 424
  12. 208
  13. 424
  14. 56
  15. 437
  16. 583
  17. 424
  18. 429
  19. 68
  20. 86
  21. 253
  22. 286
  23. 362
  24. 470
  25. 303
  26. 78
  27. 549
  28. 327
  29. 374
  30. 531
  31. 223
  32. 124
  33. 160
  34. 458
  35. 404
  36. 541
  37. 206
  38. 261
  39. 200
  40. 307

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