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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 365 · 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. 1.29 + 68 =
  2. 2.125 + 27 =
  3. 3.67 + 67 =
  4. 4.122 + 98 =
  5. 5.458 + 69 =
  6. 6.202 + 27 =
  7. 7.126 + 57 =
  8. 8.213 + 88 =
  9. 9.92 + 98 =
  10. 10.27 + 57 =
  11. 11.82 + 38 =
  12. 12.176 + 78 =
  13. 13.205 + 57 =
  14. 14.418 + 68 =
  15. 15.242 + 99 =
  16. 16.237 + 89 =
  17. 17.266 + 68 =
  18. 18.328 + 27 =
  19. 19.345 + 59 =
  20. 20.489 + 39 =
  21. 21.363 + 39 =
  22. 22.356 + 98 =
  23. 23.486 + 47 =
  24. 24.142 + 37 =
  25. 25.101 + 38 =
  26. 26.114 + 39 =
  27. 27.102 + 27 =
  28. 28.58 + 89 =
  29. 29.175 + 18 =
  30. 30.348 + 19 =
  31. 31.218 + 29 =
  32. 32.436 + 48 =
  33. 33.49 + 98 =
  34. 34.404 + 68 =
  35. 35.399 + 87 =
  36. 36.118 + 97 =
  37. 37.409 + 57 =
  38. 38.380 + 48 =
  39. 39.408 + 79 =
  40. 40.377 + 28 =

Answer key

  1. 97
  2. 152
  3. 134
  4. 220
  5. 527
  6. 229
  7. 183
  8. 301
  9. 190
  10. 84
  11. 120
  12. 254
  13. 262
  14. 486
  15. 341
  16. 326
  17. 334
  18. 355
  19. 404
  20. 528
  21. 402
  22. 454
  23. 533
  24. 179
  25. 139
  26. 153
  27. 129
  28. 147
  29. 193
  30. 367
  31. 247
  32. 484
  33. 147
  34. 472
  35. 486
  36. 215
  37. 466
  38. 428
  39. 487
  40. 405

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