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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 114 · 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. 1.223 + 18 =
  2. 2.305 + 77 =
  3. 3.218 + 37 =
  4. 4.385 + 97 =
  5. 5.483 + 19 =
  6. 6.161 + 47 =
  7. 7.411 + 98 =
  8. 8.443 + 29 =
  9. 9.334 + 57 =
  10. 10.371 + 67 =
  11. 11.426 + 18 =
  12. 12.248 + 38 =
  13. 13.480 + 19 =
  14. 14.146 + 67 =
  15. 15.82 + 58 =
  16. 16.241 + 87 =
  17. 17.399 + 29 =
  18. 18.278 + 97 =
  19. 19.103 + 37 =
  20. 20.48 + 58 =
  21. 21.293 + 19 =
  22. 22.401 + 78 =
  23. 23.357 + 97 =
  24. 24.53 + 39 =
  25. 25.104 + 17 =
  26. 26.308 + 47 =
  27. 27.37 + 29 =
  28. 28.63 + 59 =
  29. 29.385 + 38 =
  30. 30.483 + 49 =
  31. 31.355 + 69 =
  32. 32.62 + 39 =
  33. 33.182 + 27 =
  34. 34.436 + 87 =
  35. 35.466 + 19 =
  36. 36.270 + 59 =
  37. 37.380 + 49 =
  38. 38.439 + 77 =
  39. 39.451 + 19 =
  40. 40.64 + 38 =

Answer key

  1. 241
  2. 382
  3. 255
  4. 482
  5. 502
  6. 208
  7. 509
  8. 472
  9. 391
  10. 438
  11. 444
  12. 286
  13. 499
  14. 213
  15. 140
  16. 328
  17. 428
  18. 375
  19. 140
  20. 106
  21. 312
  22. 479
  23. 454
  24. 92
  25. 121
  26. 355
  27. 66
  28. 122
  29. 423
  30. 532
  31. 424
  32. 101
  33. 209
  34. 523
  35. 485
  36. 329
  37. 429
  38. 516
  39. 470
  40. 102

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