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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 263 · 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. 1.239 + 28 =
  2. 2.91 + 18 =
  3. 3.55 + 48 =
  4. 4.264 + 28 =
  5. 5.251 + 37 =
  6. 6.141 + 99 =
  7. 7.192 + 69 =
  8. 8.278 + 67 =
  9. 9.219 + 19 =
  10. 10.217 + 39 =
  11. 11.290 + 88 =
  12. 12.82 + 67 =
  13. 13.90 + 68 =
  14. 14.51 + 68 =
  15. 15.31 + 38 =
  16. 16.120 + 58 =
  17. 17.395 + 97 =
  18. 18.403 + 59 =
  19. 19.495 + 39 =
  20. 20.405 + 48 =
  21. 21.198 + 58 =
  22. 22.376 + 27 =
  23. 23.213 + 38 =
  24. 24.376 + 38 =
  25. 25.403 + 99 =
  26. 26.130 + 99 =
  27. 27.495 + 88 =
  28. 28.48 + 77 =
  29. 29.381 + 38 =
  30. 30.291 + 99 =
  31. 31.476 + 47 =
  32. 32.359 + 17 =
  33. 33.433 + 29 =
  34. 34.341 + 89 =
  35. 35.89 + 89 =
  36. 36.292 + 68 =
  37. 37.40 + 88 =
  38. 38.362 + 28 =
  39. 39.45 + 48 =
  40. 40.476 + 58 =

Answer key

  1. 267
  2. 109
  3. 103
  4. 292
  5. 288
  6. 240
  7. 261
  8. 345
  9. 238
  10. 256
  11. 378
  12. 149
  13. 158
  14. 119
  15. 69
  16. 178
  17. 492
  18. 462
  19. 534
  20. 453
  21. 256
  22. 403
  23. 251
  24. 414
  25. 502
  26. 229
  27. 583
  28. 125
  29. 419
  30. 390
  31. 523
  32. 376
  33. 462
  34. 430
  35. 178
  36. 360
  37. 128
  38. 390
  39. 93
  40. 534

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