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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 690 · 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. 1.450 + 19 =
  2. 2.284 + 37 =
  3. 3.173 + 78 =
  4. 4.88 + 99 =
  5. 5.56 + 99 =
  6. 6.458 + 28 =
  7. 7.186 + 98 =
  8. 8.112 + 77 =
  9. 9.357 + 49 =
  10. 10.374 + 77 =
  11. 11.174 + 37 =
  12. 12.178 + 88 =
  13. 13.459 + 67 =
  14. 14.439 + 57 =
  15. 15.54 + 57 =
  16. 16.28 + 69 =
  17. 17.104 + 69 =
  18. 18.184 + 77 =
  19. 19.485 + 87 =
  20. 20.371 + 39 =
  21. 21.206 + 28 =
  22. 22.240 + 67 =
  23. 23.157 + 27 =
  24. 24.226 + 38 =
  25. 25.435 + 87 =
  26. 26.443 + 58 =
  27. 27.223 + 77 =
  28. 28.413 + 89 =
  29. 29.411 + 87 =
  30. 30.328 + 17 =
  31. 31.139 + 58 =
  32. 32.482 + 69 =
  33. 33.311 + 97 =
  34. 34.375 + 28 =
  35. 35.460 + 89 =
  36. 36.96 + 28 =
  37. 37.382 + 47 =
  38. 38.125 + 89 =
  39. 39.420 + 27 =
  40. 40.115 + 17 =

Answer key

  1. 469
  2. 321
  3. 251
  4. 187
  5. 155
  6. 486
  7. 284
  8. 189
  9. 406
  10. 451
  11. 211
  12. 266
  13. 526
  14. 496
  15. 111
  16. 97
  17. 173
  18. 261
  19. 572
  20. 410
  21. 234
  22. 307
  23. 184
  24. 264
  25. 522
  26. 501
  27. 300
  28. 502
  29. 498
  30. 345
  31. 197
  32. 551
  33. 408
  34. 403
  35. 549
  36. 124
  37. 429
  38. 214
  39. 447
  40. 132

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