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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 288 · 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. 1.446 + 37 =
  2. 2.359 + 38 =
  3. 3.439 + 28 =
  4. 4.350 + 87 =
  5. 5.247 + 87 =
  6. 6.219 + 99 =
  7. 7.208 + 49 =
  8. 8.94 + 77 =
  9. 9.185 + 57 =
  10. 10.243 + 27 =
  11. 11.31 + 19 =
  12. 12.308 + 99 =
  13. 13.435 + 38 =
  14. 14.419 + 97 =
  15. 15.183 + 98 =
  16. 16.349 + 17 =
  17. 17.85 + 89 =
  18. 18.66 + 79 =
  19. 19.474 + 39 =
  20. 20.277 + 27 =
  21. 21.91 + 17 =
  22. 22.205 + 77 =
  23. 23.135 + 78 =
  24. 24.194 + 57 =
  25. 25.345 + 29 =
  26. 26.95 + 48 =
  27. 27.410 + 17 =
  28. 28.168 + 58 =
  29. 29.428 + 67 =
  30. 30.109 + 78 =
  31. 31.228 + 98 =
  32. 32.303 + 87 =
  33. 33.464 + 27 =
  34. 34.329 + 97 =
  35. 35.168 + 27 =
  36. 36.321 + 49 =
  37. 37.289 + 18 =
  38. 38.111 + 68 =
  39. 39.149 + 98 =
  40. 40.477 + 78 =

Answer key

  1. 483
  2. 397
  3. 467
  4. 437
  5. 334
  6. 318
  7. 257
  8. 171
  9. 242
  10. 270
  11. 50
  12. 407
  13. 473
  14. 516
  15. 281
  16. 366
  17. 174
  18. 145
  19. 513
  20. 304
  21. 108
  22. 282
  23. 213
  24. 251
  25. 374
  26. 143
  27. 427
  28. 226
  29. 495
  30. 187
  31. 326
  32. 390
  33. 491
  34. 426
  35. 195
  36. 370
  37. 307
  38. 179
  39. 247
  40. 555

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