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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 309 · 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. 1.179 + 27 =
  2. 2.445 + 89 =
  3. 3.163 + 89 =
  4. 4.66 + 67 =
  5. 5.118 + 49 =
  6. 6.247 + 67 =
  7. 7.154 + 97 =
  8. 8.161 + 18 =
  9. 9.457 + 37 =
  10. 10.267 + 28 =
  11. 11.197 + 29 =
  12. 12.182 + 49 =
  13. 13.493 + 87 =
  14. 14.200 + 57 =
  15. 15.400 + 99 =
  16. 16.472 + 57 =
  17. 17.496 + 27 =
  18. 18.344 + 57 =
  19. 19.384 + 28 =
  20. 20.494 + 69 =
  21. 21.170 + 99 =
  22. 22.107 + 27 =
  23. 23.184 + 18 =
  24. 24.254 + 87 =
  25. 25.496 + 38 =
  26. 26.328 + 87 =
  27. 27.60 + 67 =
  28. 28.443 + 57 =
  29. 29.298 + 18 =
  30. 30.308 + 77 =
  31. 31.461 + 89 =
  32. 32.118 + 67 =
  33. 33.398 + 39 =
  34. 34.111 + 78 =
  35. 35.336 + 47 =
  36. 36.209 + 49 =
  37. 37.301 + 49 =
  38. 38.444 + 19 =
  39. 39.55 + 17 =
  40. 40.416 + 39 =

Answer key

  1. 206
  2. 534
  3. 252
  4. 133
  5. 167
  6. 314
  7. 251
  8. 179
  9. 494
  10. 295
  11. 226
  12. 231
  13. 580
  14. 257
  15. 499
  16. 529
  17. 523
  18. 401
  19. 412
  20. 563
  21. 269
  22. 134
  23. 202
  24. 341
  25. 534
  26. 415
  27. 127
  28. 500
  29. 316
  30. 385
  31. 550
  32. 185
  33. 437
  34. 189
  35. 383
  36. 258
  37. 350
  38. 463
  39. 72
  40. 455

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