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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 432 · 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. 1.352 + 27 =
  2. 2.223 + 79 =
  3. 3.330 + 59 =
  4. 4.356 + 87 =
  5. 5.206 + 29 =
  6. 6.400 + 39 =
  7. 7.108 + 39 =
  8. 8.446 + 79 =
  9. 9.333 + 68 =
  10. 10.44 + 18 =
  11. 11.448 + 28 =
  12. 12.85 + 47 =
  13. 13.323 + 18 =
  14. 14.269 + 97 =
  15. 15.377 + 87 =
  16. 16.374 + 98 =
  17. 17.167 + 39 =
  18. 18.105 + 89 =
  19. 19.430 + 99 =
  20. 20.101 + 58 =
  21. 21.80 + 99 =
  22. 22.159 + 49 =
  23. 23.284 + 39 =
  24. 24.51 + 38 =
  25. 25.100 + 87 =
  26. 26.102 + 29 =
  27. 27.275 + 58 =
  28. 28.166 + 88 =
  29. 29.300 + 38 =
  30. 30.480 + 99 =
  31. 31.195 + 77 =
  32. 32.366 + 39 =
  33. 33.383 + 57 =
  34. 34.25 + 28 =
  35. 35.53 + 29 =
  36. 36.109 + 67 =
  37. 37.362 + 99 =
  38. 38.481 + 87 =
  39. 39.37 + 49 =
  40. 40.105 + 19 =

Answer key

  1. 379
  2. 302
  3. 389
  4. 443
  5. 235
  6. 439
  7. 147
  8. 525
  9. 401
  10. 62
  11. 476
  12. 132
  13. 341
  14. 366
  15. 464
  16. 472
  17. 206
  18. 194
  19. 529
  20. 159
  21. 179
  22. 208
  23. 323
  24. 89
  25. 187
  26. 131
  27. 333
  28. 254
  29. 338
  30. 579
  31. 272
  32. 405
  33. 440
  34. 53
  35. 82
  36. 176
  37. 461
  38. 568
  39. 86
  40. 124

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