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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 538 · 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. 1.123 + 88 =
  2. 2.265 + 87 =
  3. 3.216 + 18 =
  4. 4.265 + 27 =
  5. 5.306 + 97 =
  6. 6.250 + 59 =
  7. 7.344 + 79 =
  8. 8.364 + 89 =
  9. 9.326 + 89 =
  10. 10.52 + 48 =
  11. 11.37 + 39 =
  12. 12.373 + 88 =
  13. 13.39 + 88 =
  14. 14.460 + 57 =
  15. 15.128 + 39 =
  16. 16.35 + 69 =
  17. 17.221 + 89 =
  18. 18.272 + 49 =
  19. 19.148 + 59 =
  20. 20.390 + 18 =
  21. 21.303 + 77 =
  22. 22.196 + 27 =
  23. 23.482 + 28 =
  24. 24.240 + 79 =
  25. 25.403 + 89 =
  26. 26.173 + 89 =
  27. 27.386 + 49 =
  28. 28.478 + 37 =
  29. 29.289 + 47 =
  30. 30.244 + 27 =
  31. 31.40 + 88 =
  32. 32.160 + 97 =
  33. 33.496 + 48 =
  34. 34.258 + 79 =
  35. 35.395 + 48 =
  36. 36.84 + 18 =
  37. 37.212 + 28 =
  38. 38.137 + 97 =
  39. 39.313 + 97 =
  40. 40.434 + 99 =

Answer key

  1. 211
  2. 352
  3. 234
  4. 292
  5. 403
  6. 309
  7. 423
  8. 453
  9. 415
  10. 100
  11. 76
  12. 461
  13. 127
  14. 517
  15. 167
  16. 104
  17. 310
  18. 321
  19. 207
  20. 408
  21. 380
  22. 223
  23. 510
  24. 319
  25. 492
  26. 262
  27. 435
  28. 515
  29. 336
  30. 271
  31. 128
  32. 257
  33. 544
  34. 337
  35. 443
  36. 102
  37. 240
  38. 234
  39. 410
  40. 533

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