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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 514 · 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. 1.487 + 18 =
  2. 2.313 + 79 =
  3. 3.61 + 78 =
  4. 4.436 + 78 =
  5. 5.67 + 67 =
  6. 6.253 + 48 =
  7. 7.131 + 68 =
  8. 8.247 + 57 =
  9. 9.499 + 69 =
  10. 10.157 + 89 =
  11. 11.167 + 67 =
  12. 12.129 + 99 =
  13. 13.341 + 59 =
  14. 14.74 + 67 =
  15. 15.228 + 79 =
  16. 16.231 + 48 =
  17. 17.109 + 89 =
  18. 18.38 + 27 =
  19. 19.471 + 19 =
  20. 20.319 + 77 =
  21. 21.305 + 57 =
  22. 22.26 + 17 =
  23. 23.147 + 67 =
  24. 24.69 + 18 =
  25. 25.431 + 37 =
  26. 26.249 + 28 =
  27. 27.452 + 97 =
  28. 28.134 + 58 =
  29. 29.311 + 78 =
  30. 30.441 + 28 =
  31. 31.350 + 39 =
  32. 32.336 + 99 =
  33. 33.389 + 39 =
  34. 34.55 + 19 =
  35. 35.444 + 19 =
  36. 36.165 + 69 =
  37. 37.160 + 18 =
  38. 38.212 + 77 =
  39. 39.471 + 17 =
  40. 40.313 + 27 =

Answer key

  1. 505
  2. 392
  3. 139
  4. 514
  5. 134
  6. 301
  7. 199
  8. 304
  9. 568
  10. 246
  11. 234
  12. 228
  13. 400
  14. 141
  15. 307
  16. 279
  17. 198
  18. 65
  19. 490
  20. 396
  21. 362
  22. 43
  23. 214
  24. 87
  25. 468
  26. 277
  27. 549
  28. 192
  29. 389
  30. 469
  31. 389
  32. 435
  33. 428
  34. 74
  35. 463
  36. 234
  37. 178
  38. 289
  39. 488
  40. 340

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