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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 540 · 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. 1.473 + 37 =
  2. 2.357 + 19 =
  3. 3.185 + 17 =
  4. 4.440 + 87 =
  5. 5.111 + 89 =
  6. 6.140 + 79 =
  7. 7.108 + 57 =
  8. 8.489 + 48 =
  9. 9.69 + 19 =
  10. 10.152 + 87 =
  11. 11.241 + 77 =
  12. 12.447 + 99 =
  13. 13.449 + 68 =
  14. 14.179 + 27 =
  15. 15.318 + 67 =
  16. 16.99 + 38 =
  17. 17.42 + 57 =
  18. 18.344 + 67 =
  19. 19.182 + 57 =
  20. 20.32 + 28 =
  21. 21.332 + 99 =
  22. 22.174 + 49 =
  23. 23.199 + 69 =
  24. 24.140 + 68 =
  25. 25.51 + 29 =
  26. 26.39 + 98 =
  27. 27.322 + 29 =
  28. 28.465 + 68 =
  29. 29.434 + 47 =
  30. 30.163 + 39 =
  31. 31.474 + 78 =
  32. 32.49 + 67 =
  33. 33.182 + 48 =
  34. 34.154 + 49 =
  35. 35.255 + 48 =
  36. 36.91 + 67 =
  37. 37.419 + 97 =
  38. 38.366 + 27 =
  39. 39.470 + 59 =
  40. 40.469 + 87 =

Answer key

  1. 510
  2. 376
  3. 202
  4. 527
  5. 200
  6. 219
  7. 165
  8. 537
  9. 88
  10. 239
  11. 318
  12. 546
  13. 517
  14. 206
  15. 385
  16. 137
  17. 99
  18. 411
  19. 239
  20. 60
  21. 431
  22. 223
  23. 268
  24. 208
  25. 80
  26. 137
  27. 351
  28. 533
  29. 481
  30. 202
  31. 552
  32. 116
  33. 230
  34. 203
  35. 303
  36. 158
  37. 516
  38. 393
  39. 529
  40. 556

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