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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 299 · 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. 1.123 + 37 =
  2. 2.496 + 17 =
  3. 3.293 + 59 =
  4. 4.191 + 18 =
  5. 5.306 + 47 =
  6. 6.359 + 89 =
  7. 7.70 + 97 =
  8. 8.355 + 89 =
  9. 9.339 + 39 =
  10. 10.403 + 48 =
  11. 11.288 + 97 =
  12. 12.47 + 99 =
  13. 13.158 + 97 =
  14. 14.280 + 28 =
  15. 15.295 + 27 =
  16. 16.168 + 88 =
  17. 17.491 + 69 =
  18. 18.396 + 18 =
  19. 19.330 + 58 =
  20. 20.238 + 28 =
  21. 21.393 + 29 =
  22. 22.497 + 29 =
  23. 23.324 + 88 =
  24. 24.136 + 58 =
  25. 25.139 + 68 =
  26. 26.294 + 89 =
  27. 27.149 + 19 =
  28. 28.411 + 19 =
  29. 29.390 + 27 =
  30. 30.25 + 27 =
  31. 31.29 + 77 =
  32. 32.213 + 57 =
  33. 33.428 + 29 =
  34. 34.356 + 18 =
  35. 35.128 + 87 =
  36. 36.379 + 88 =
  37. 37.122 + 49 =
  38. 38.312 + 29 =
  39. 39.397 + 59 =
  40. 40.73 + 38 =

Answer key

  1. 160
  2. 513
  3. 352
  4. 209
  5. 353
  6. 448
  7. 167
  8. 444
  9. 378
  10. 451
  11. 385
  12. 146
  13. 255
  14. 308
  15. 322
  16. 256
  17. 560
  18. 414
  19. 388
  20. 266
  21. 422
  22. 526
  23. 412
  24. 194
  25. 207
  26. 383
  27. 168
  28. 430
  29. 417
  30. 52
  31. 106
  32. 270
  33. 457
  34. 374
  35. 215
  36. 467
  37. 171
  38. 341
  39. 456
  40. 111

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