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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 117 · 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. 1.375 + 28 =
  2. 2.157 + 47 =
  3. 3.156 + 48 =
  4. 4.144 + 27 =
  5. 5.294 + 47 =
  6. 6.420 + 17 =
  7. 7.88 + 98 =
  8. 8.52 + 78 =
  9. 9.324 + 89 =
  10. 10.333 + 98 =
  11. 11.251 + 59 =
  12. 12.63 + 59 =
  13. 13.366 + 47 =
  14. 14.99 + 88 =
  15. 15.416 + 68 =
  16. 16.360 + 18 =
  17. 17.41 + 68 =
  18. 18.258 + 97 =
  19. 19.204 + 68 =
  20. 20.80 + 38 =
  21. 21.349 + 57 =
  22. 22.35 + 38 =
  23. 23.238 + 38 =
  24. 24.162 + 68 =
  25. 25.449 + 79 =
  26. 26.33 + 48 =
  27. 27.25 + 58 =
  28. 28.201 + 27 =
  29. 29.103 + 58 =
  30. 30.271 + 28 =
  31. 31.216 + 97 =
  32. 32.253 + 27 =
  33. 33.203 + 47 =
  34. 34.391 + 98 =
  35. 35.65 + 97 =
  36. 36.345 + 17 =
  37. 37.391 + 27 =
  38. 38.351 + 17 =
  39. 39.36 + 17 =
  40. 40.416 + 97 =

Answer key

  1. 403
  2. 204
  3. 204
  4. 171
  5. 341
  6. 437
  7. 186
  8. 130
  9. 413
  10. 431
  11. 310
  12. 122
  13. 413
  14. 187
  15. 484
  16. 378
  17. 109
  18. 355
  19. 272
  20. 118
  21. 406
  22. 73
  23. 276
  24. 230
  25. 528
  26. 81
  27. 83
  28. 228
  29. 161
  30. 299
  31. 313
  32. 280
  33. 250
  34. 489
  35. 162
  36. 362
  37. 418
  38. 368
  39. 53
  40. 513

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