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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 773 · 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. 1.252 + 67 =
  2. 2.312 + 79 =
  3. 3.103 + 17 =
  4. 4.486 + 78 =
  5. 5.56 + 78 =
  6. 6.147 + 38 =
  7. 7.60 + 58 =
  8. 8.51 + 87 =
  9. 9.425 + 87 =
  10. 10.248 + 18 =
  11. 11.101 + 49 =
  12. 12.264 + 97 =
  13. 13.382 + 47 =
  14. 14.341 + 59 =
  15. 15.156 + 38 =
  16. 16.379 + 87 =
  17. 17.483 + 17 =
  18. 18.327 + 98 =
  19. 19.420 + 57 =
  20. 20.286 + 18 =
  21. 21.417 + 69 =
  22. 22.247 + 89 =
  23. 23.406 + 17 =
  24. 24.473 + 89 =
  25. 25.128 + 78 =
  26. 26.299 + 77 =
  27. 27.442 + 49 =
  28. 28.473 + 69 =
  29. 29.463 + 17 =
  30. 30.49 + 77 =
  31. 31.141 + 39 =
  32. 32.495 + 78 =
  33. 33.430 + 27 =
  34. 34.33 + 17 =
  35. 35.306 + 49 =
  36. 36.446 + 79 =
  37. 37.129 + 99 =
  38. 38.336 + 19 =
  39. 39.455 + 57 =
  40. 40.375 + 89 =

Answer key

  1. 319
  2. 391
  3. 120
  4. 564
  5. 134
  6. 185
  7. 118
  8. 138
  9. 512
  10. 266
  11. 150
  12. 361
  13. 429
  14. 400
  15. 194
  16. 466
  17. 500
  18. 425
  19. 477
  20. 304
  21. 486
  22. 336
  23. 423
  24. 562
  25. 206
  26. 376
  27. 491
  28. 542
  29. 480
  30. 126
  31. 180
  32. 573
  33. 457
  34. 50
  35. 355
  36. 525
  37. 228
  38. 355
  39. 512
  40. 464

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