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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 619 · 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. 1.26 + 18 =
  2. 2.136 + 59 =
  3. 3.32 + 49 =
  4. 4.498 + 38 =
  5. 5.396 + 47 =
  6. 6.309 + 37 =
  7. 7.271 + 69 =
  8. 8.441 + 89 =
  9. 9.479 + 48 =
  10. 10.477 + 57 =
  11. 11.379 + 87 =
  12. 12.235 + 97 =
  13. 13.66 + 67 =
  14. 14.286 + 49 =
  15. 15.199 + 98 =
  16. 16.25 + 69 =
  17. 17.327 + 88 =
  18. 18.367 + 77 =
  19. 19.80 + 27 =
  20. 20.193 + 29 =
  21. 21.134 + 48 =
  22. 22.132 + 67 =
  23. 23.293 + 37 =
  24. 24.317 + 39 =
  25. 25.347 + 78 =
  26. 26.168 + 59 =
  27. 27.475 + 49 =
  28. 28.396 + 89 =
  29. 29.259 + 37 =
  30. 30.299 + 98 =
  31. 31.277 + 87 =
  32. 32.36 + 17 =
  33. 33.107 + 37 =
  34. 34.225 + 17 =
  35. 35.31 + 38 =
  36. 36.248 + 87 =
  37. 37.140 + 97 =
  38. 38.347 + 77 =
  39. 39.406 + 38 =
  40. 40.365 + 57 =

Answer key

  1. 44
  2. 195
  3. 81
  4. 536
  5. 443
  6. 346
  7. 340
  8. 530
  9. 527
  10. 534
  11. 466
  12. 332
  13. 133
  14. 335
  15. 297
  16. 94
  17. 415
  18. 444
  19. 107
  20. 222
  21. 182
  22. 199
  23. 330
  24. 356
  25. 425
  26. 227
  27. 524
  28. 485
  29. 296
  30. 397
  31. 364
  32. 53
  33. 144
  34. 242
  35. 69
  36. 335
  37. 237
  38. 424
  39. 444
  40. 422

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