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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 626 · 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. 1.423 + 98 =
  2. 2.97 + 89 =
  3. 3.49 + 88 =
  4. 4.39 + 79 =
  5. 5.274 + 99 =
  6. 6.420 + 48 =
  7. 7.421 + 28 =
  8. 8.489 + 18 =
  9. 9.226 + 59 =
  10. 10.405 + 37 =
  11. 11.275 + 88 =
  12. 12.68 + 18 =
  13. 13.205 + 69 =
  14. 14.247 + 49 =
  15. 15.394 + 78 =
  16. 16.492 + 57 =
  17. 17.95 + 77 =
  18. 18.260 + 49 =
  19. 19.39 + 48 =
  20. 20.471 + 57 =
  21. 21.268 + 49 =
  22. 22.317 + 98 =
  23. 23.147 + 17 =
  24. 24.459 + 39 =
  25. 25.354 + 88 =
  26. 26.212 + 37 =
  27. 27.109 + 98 =
  28. 28.330 + 67 =
  29. 29.410 + 18 =
  30. 30.158 + 37 =
  31. 31.249 + 77 =
  32. 32.170 + 29 =
  33. 33.382 + 39 =
  34. 34.55 + 79 =
  35. 35.464 + 59 =
  36. 36.211 + 57 =
  37. 37.32 + 67 =
  38. 38.421 + 79 =
  39. 39.300 + 97 =
  40. 40.462 + 99 =

Answer key

  1. 521
  2. 186
  3. 137
  4. 118
  5. 373
  6. 468
  7. 449
  8. 507
  9. 285
  10. 442
  11. 363
  12. 86
  13. 274
  14. 296
  15. 472
  16. 549
  17. 172
  18. 309
  19. 87
  20. 528
  21. 317
  22. 415
  23. 164
  24. 498
  25. 442
  26. 249
  27. 207
  28. 397
  29. 428
  30. 195
  31. 326
  32. 199
  33. 421
  34. 134
  35. 523
  36. 268
  37. 99
  38. 500
  39. 397
  40. 561

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