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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 249 · 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. 1.283 + 89 =
  2. 2.223 + 28 =
  3. 3.133 + 89 =
  4. 4.320 + 98 =
  5. 5.367 + 27 =
  6. 6.380 + 49 =
  7. 7.398 + 17 =
  8. 8.291 + 67 =
  9. 9.351 + 39 =
  10. 10.181 + 68 =
  11. 11.52 + 27 =
  12. 12.427 + 27 =
  13. 13.481 + 68 =
  14. 14.288 + 29 =
  15. 15.135 + 97 =
  16. 16.181 + 57 =
  17. 17.257 + 79 =
  18. 18.361 + 27 =
  19. 19.341 + 38 =
  20. 20.39 + 87 =
  21. 21.460 + 77 =
  22. 22.186 + 58 =
  23. 23.429 + 77 =
  24. 24.344 + 27 =
  25. 25.414 + 48 =
  26. 26.179 + 37 =
  27. 27.371 + 88 =
  28. 28.491 + 79 =
  29. 29.420 + 77 =
  30. 30.375 + 27 =
  31. 31.379 + 67 =
  32. 32.59 + 77 =
  33. 33.70 + 87 =
  34. 34.374 + 67 =
  35. 35.218 + 77 =
  36. 36.233 + 69 =
  37. 37.43 + 29 =
  38. 38.455 + 97 =
  39. 39.147 + 28 =
  40. 40.281 + 38 =

Answer key

  1. 372
  2. 251
  3. 222
  4. 418
  5. 394
  6. 429
  7. 415
  8. 358
  9. 390
  10. 249
  11. 79
  12. 454
  13. 549
  14. 317
  15. 232
  16. 238
  17. 336
  18. 388
  19. 379
  20. 126
  21. 537
  22. 244
  23. 506
  24. 371
  25. 462
  26. 216
  27. 459
  28. 570
  29. 497
  30. 402
  31. 446
  32. 136
  33. 157
  34. 441
  35. 295
  36. 302
  37. 72
  38. 552
  39. 175
  40. 319

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