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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 606 · 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. 1.212 + 49 =
  2. 2.496 + 27 =
  3. 3.181 + 58 =
  4. 4.400 + 37 =
  5. 5.260 + 69 =
  6. 6.50 + 77 =
  7. 7.375 + 29 =
  8. 8.299 + 68 =
  9. 9.199 + 18 =
  10. 10.233 + 37 =
  11. 11.86 + 28 =
  12. 12.273 + 77 =
  13. 13.89 + 69 =
  14. 14.39 + 57 =
  15. 15.403 + 17 =
  16. 16.269 + 68 =
  17. 17.377 + 59 =
  18. 18.427 + 99 =
  19. 19.40 + 99 =
  20. 20.201 + 29 =
  21. 21.296 + 37 =
  22. 22.360 + 49 =
  23. 23.333 + 37 =
  24. 24.128 + 97 =
  25. 25.184 + 68 =
  26. 26.406 + 39 =
  27. 27.299 + 57 =
  28. 28.306 + 79 =
  29. 29.289 + 77 =
  30. 30.60 + 88 =
  31. 31.287 + 58 =
  32. 32.334 + 79 =
  33. 33.262 + 19 =
  34. 34.429 + 38 =
  35. 35.217 + 27 =
  36. 36.319 + 17 =
  37. 37.313 + 27 =
  38. 38.305 + 48 =
  39. 39.133 + 89 =
  40. 40.261 + 28 =

Answer key

  1. 261
  2. 523
  3. 239
  4. 437
  5. 329
  6. 127
  7. 404
  8. 367
  9. 217
  10. 270
  11. 114
  12. 350
  13. 158
  14. 96
  15. 420
  16. 337
  17. 436
  18. 526
  19. 139
  20. 230
  21. 333
  22. 409
  23. 370
  24. 225
  25. 252
  26. 445
  27. 356
  28. 385
  29. 366
  30. 148
  31. 345
  32. 413
  33. 281
  34. 467
  35. 244
  36. 336
  37. 340
  38. 353
  39. 222
  40. 289

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