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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 437 · 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. 1.267 + 27 =
  2. 2.448 + 69 =
  3. 3.27 + 17 =
  4. 4.40 + 49 =
  5. 5.248 + 58 =
  6. 6.152 + 77 =
  7. 7.45 + 29 =
  8. 8.311 + 49 =
  9. 9.476 + 47 =
  10. 10.423 + 38 =
  11. 11.483 + 97 =
  12. 12.152 + 29 =
  13. 13.334 + 28 =
  14. 14.415 + 69 =
  15. 15.390 + 47 =
  16. 16.233 + 49 =
  17. 17.168 + 47 =
  18. 18.179 + 59 =
  19. 19.318 + 78 =
  20. 20.471 + 19 =
  21. 21.220 + 57 =
  22. 22.180 + 98 =
  23. 23.164 + 17 =
  24. 24.121 + 29 =
  25. 25.329 + 18 =
  26. 26.454 + 89 =
  27. 27.314 + 98 =
  28. 28.383 + 28 =
  29. 29.423 + 18 =
  30. 30.143 + 49 =
  31. 31.416 + 29 =
  32. 32.164 + 67 =
  33. 33.192 + 49 =
  34. 34.286 + 29 =
  35. 35.299 + 87 =
  36. 36.485 + 38 =
  37. 37.37 + 18 =
  38. 38.405 + 19 =
  39. 39.145 + 18 =
  40. 40.320 + 58 =

Answer key

  1. 294
  2. 517
  3. 44
  4. 89
  5. 306
  6. 229
  7. 74
  8. 360
  9. 523
  10. 461
  11. 580
  12. 181
  13. 362
  14. 484
  15. 437
  16. 282
  17. 215
  18. 238
  19. 396
  20. 490
  21. 277
  22. 278
  23. 181
  24. 150
  25. 347
  26. 543
  27. 412
  28. 411
  29. 441
  30. 192
  31. 445
  32. 231
  33. 241
  34. 315
  35. 386
  36. 523
  37. 55
  38. 424
  39. 163
  40. 378

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