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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 102 · 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. 1.256 + 88 =
  2. 2.382 + 98 =
  3. 3.340 + 78 =
  4. 4.392 + 68 =
  5. 5.271 + 89 =
  6. 6.44 + 37 =
  7. 7.113 + 78 =
  8. 8.384 + 89 =
  9. 9.70 + 97 =
  10. 10.89 + 19 =
  11. 11.50 + 79 =
  12. 12.202 + 58 =
  13. 13.100 + 69 =
  14. 14.46 + 77 =
  15. 15.451 + 57 =
  16. 16.308 + 49 =
  17. 17.418 + 77 =
  18. 18.275 + 19 =
  19. 19.92 + 98 =
  20. 20.312 + 69 =
  21. 21.140 + 87 =
  22. 22.288 + 27 =
  23. 23.72 + 97 =
  24. 24.325 + 37 =
  25. 25.401 + 68 =
  26. 26.443 + 67 =
  27. 27.115 + 27 =
  28. 28.150 + 89 =
  29. 29.196 + 97 =
  30. 30.282 + 67 =
  31. 31.438 + 78 =
  32. 32.335 + 38 =
  33. 33.356 + 57 =
  34. 34.142 + 18 =
  35. 35.403 + 57 =
  36. 36.356 + 68 =
  37. 37.105 + 59 =
  38. 38.95 + 39 =
  39. 39.382 + 67 =
  40. 40.363 + 39 =

Answer key

  1. 344
  2. 480
  3. 418
  4. 460
  5. 360
  6. 81
  7. 191
  8. 473
  9. 167
  10. 108
  11. 129
  12. 260
  13. 169
  14. 123
  15. 508
  16. 357
  17. 495
  18. 294
  19. 190
  20. 381
  21. 227
  22. 315
  23. 169
  24. 362
  25. 469
  26. 510
  27. 142
  28. 239
  29. 293
  30. 349
  31. 516
  32. 373
  33. 413
  34. 160
  35. 460
  36. 424
  37. 164
  38. 134
  39. 449
  40. 402

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