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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 135 · 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. 1.182 + 28 =
  2. 2.253 + 88 =
  3. 3.158 + 88 =
  4. 4.139 + 87 =
  5. 5.403 + 88 =
  6. 6.478 + 67 =
  7. 7.66 + 88 =
  8. 8.335 + 18 =
  9. 9.286 + 58 =
  10. 10.487 + 38 =
  11. 11.229 + 87 =
  12. 12.383 + 39 =
  13. 13.465 + 78 =
  14. 14.360 + 37 =
  15. 15.115 + 89 =
  16. 16.387 + 79 =
  17. 17.234 + 78 =
  18. 18.106 + 19 =
  19. 19.192 + 19 =
  20. 20.479 + 77 =
  21. 21.426 + 87 =
  22. 22.414 + 38 =
  23. 23.168 + 59 =
  24. 24.436 + 47 =
  25. 25.154 + 79 =
  26. 26.236 + 99 =
  27. 27.170 + 37 =
  28. 28.120 + 18 =
  29. 29.141 + 99 =
  30. 30.394 + 99 =
  31. 31.456 + 39 =
  32. 32.71 + 99 =
  33. 33.323 + 88 =
  34. 34.402 + 59 =
  35. 35.357 + 37 =
  36. 36.387 + 39 =
  37. 37.200 + 98 =
  38. 38.149 + 68 =
  39. 39.153 + 68 =
  40. 40.498 + 67 =

Answer key

  1. 210
  2. 341
  3. 246
  4. 226
  5. 491
  6. 545
  7. 154
  8. 353
  9. 344
  10. 525
  11. 316
  12. 422
  13. 543
  14. 397
  15. 204
  16. 466
  17. 312
  18. 125
  19. 211
  20. 556
  21. 513
  22. 452
  23. 227
  24. 483
  25. 233
  26. 335
  27. 207
  28. 138
  29. 240
  30. 493
  31. 495
  32. 170
  33. 411
  34. 461
  35. 394
  36. 426
  37. 298
  38. 217
  39. 221
  40. 565

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