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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 32 · 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. 1.116 + 69 =
  2. 2.462 + 79 =
  3. 3.255 + 37 =
  4. 4.495 + 28 =
  5. 5.252 + 69 =
  6. 6.88 + 27 =
  7. 7.55 + 37 =
  8. 8.393 + 27 =
  9. 9.213 + 97 =
  10. 10.212 + 99 =
  11. 11.253 + 18 =
  12. 12.294 + 78 =
  13. 13.86 + 87 =
  14. 14.178 + 47 =
  15. 15.104 + 19 =
  16. 16.314 + 18 =
  17. 17.416 + 97 =
  18. 18.30 + 27 =
  19. 19.88 + 37 =
  20. 20.108 + 68 =
  21. 21.157 + 27 =
  22. 22.495 + 87 =
  23. 23.157 + 28 =
  24. 24.432 + 97 =
  25. 25.438 + 18 =
  26. 26.61 + 19 =
  27. 27.48 + 89 =
  28. 28.98 + 89 =
  29. 29.271 + 78 =
  30. 30.303 + 79 =
  31. 31.138 + 28 =
  32. 32.189 + 87 =
  33. 33.362 + 49 =
  34. 34.72 + 57 =
  35. 35.194 + 79 =
  36. 36.206 + 38 =
  37. 37.242 + 98 =
  38. 38.340 + 87 =
  39. 39.409 + 99 =
  40. 40.382 + 77 =

Answer key

  1. 185
  2. 541
  3. 292
  4. 523
  5. 321
  6. 115
  7. 92
  8. 420
  9. 310
  10. 311
  11. 271
  12. 372
  13. 173
  14. 225
  15. 123
  16. 332
  17. 513
  18. 57
  19. 125
  20. 176
  21. 184
  22. 582
  23. 185
  24. 529
  25. 456
  26. 80
  27. 137
  28. 187
  29. 349
  30. 382
  31. 166
  32. 276
  33. 411
  34. 129
  35. 273
  36. 244
  37. 340
  38. 427
  39. 508
  40. 459

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