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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 254 · 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. 1.277 + 99 =
  2. 2.112 + 68 =
  3. 3.332 + 37 =
  4. 4.492 + 39 =
  5. 5.155 + 97 =
  6. 6.75 + 77 =
  7. 7.406 + 48 =
  8. 8.126 + 48 =
  9. 9.411 + 78 =
  10. 10.443 + 79 =
  11. 11.96 + 19 =
  12. 12.418 + 18 =
  13. 13.85 + 18 =
  14. 14.321 + 89 =
  15. 15.47 + 49 =
  16. 16.102 + 87 =
  17. 17.109 + 79 =
  18. 18.478 + 67 =
  19. 19.384 + 37 =
  20. 20.26 + 38 =
  21. 21.233 + 27 =
  22. 22.57 + 18 =
  23. 23.342 + 37 =
  24. 24.129 + 89 =
  25. 25.180 + 49 =
  26. 26.471 + 67 =
  27. 27.377 + 77 =
  28. 28.213 + 89 =
  29. 29.240 + 28 =
  30. 30.254 + 79 =
  31. 31.96 + 69 =
  32. 32.87 + 98 =
  33. 33.409 + 97 =
  34. 34.431 + 37 =
  35. 35.33 + 47 =
  36. 36.100 + 68 =
  37. 37.389 + 49 =
  38. 38.59 + 27 =
  39. 39.25 + 99 =
  40. 40.194 + 38 =

Answer key

  1. 376
  2. 180
  3. 369
  4. 531
  5. 252
  6. 152
  7. 454
  8. 174
  9. 489
  10. 522
  11. 115
  12. 436
  13. 103
  14. 410
  15. 96
  16. 189
  17. 188
  18. 545
  19. 421
  20. 64
  21. 260
  22. 75
  23. 379
  24. 218
  25. 229
  26. 538
  27. 454
  28. 302
  29. 268
  30. 333
  31. 165
  32. 185
  33. 506
  34. 468
  35. 80
  36. 168
  37. 438
  38. 86
  39. 124
  40. 232

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