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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 559 · 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. 1.192 + 47 =
  2. 2.61 + 77 =
  3. 3.85 + 97 =
  4. 4.209 + 49 =
  5. 5.406 + 37 =
  6. 6.167 + 77 =
  7. 7.457 + 27 =
  8. 8.226 + 59 =
  9. 9.74 + 88 =
  10. 10.223 + 97 =
  11. 11.126 + 97 =
  12. 12.465 + 47 =
  13. 13.86 + 67 =
  14. 14.340 + 98 =
  15. 15.485 + 89 =
  16. 16.416 + 39 =
  17. 17.126 + 29 =
  18. 18.31 + 28 =
  19. 19.277 + 19 =
  20. 20.227 + 18 =
  21. 21.53 + 48 =
  22. 22.367 + 18 =
  23. 23.89 + 79 =
  24. 24.431 + 18 =
  25. 25.28 + 69 =
  26. 26.189 + 47 =
  27. 27.366 + 58 =
  28. 28.150 + 58 =
  29. 29.325 + 47 =
  30. 30.419 + 67 =
  31. 31.245 + 19 =
  32. 32.179 + 69 =
  33. 33.383 + 38 =
  34. 34.397 + 87 =
  35. 35.407 + 49 =
  36. 36.394 + 18 =
  37. 37.124 + 67 =
  38. 38.313 + 78 =
  39. 39.381 + 37 =
  40. 40.131 + 28 =

Answer key

  1. 239
  2. 138
  3. 182
  4. 258
  5. 443
  6. 244
  7. 484
  8. 285
  9. 162
  10. 320
  11. 223
  12. 512
  13. 153
  14. 438
  15. 574
  16. 455
  17. 155
  18. 59
  19. 296
  20. 245
  21. 101
  22. 385
  23. 168
  24. 449
  25. 97
  26. 236
  27. 424
  28. 208
  29. 372
  30. 486
  31. 264
  32. 248
  33. 421
  34. 484
  35. 456
  36. 412
  37. 191
  38. 391
  39. 418
  40. 159

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