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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 34 · 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. 1.86 + 58 =
  2. 2.158 + 17 =
  3. 3.147 + 59 =
  4. 4.215 + 28 =
  5. 5.179 + 38 =
  6. 6.53 + 89 =
  7. 7.252 + 58 =
  8. 8.238 + 17 =
  9. 9.382 + 59 =
  10. 10.73 + 39 =
  11. 11.138 + 87 =
  12. 12.484 + 17 =
  13. 13.178 + 88 =
  14. 14.36 + 49 =
  15. 15.183 + 58 =
  16. 16.174 + 28 =
  17. 17.223 + 67 =
  18. 18.174 + 29 =
  19. 19.103 + 28 =
  20. 20.329 + 98 =
  21. 21.233 + 97 =
  22. 22.59 + 47 =
  23. 23.199 + 57 =
  24. 24.401 + 77 =
  25. 25.431 + 29 =
  26. 26.104 + 89 =
  27. 27.336 + 89 =
  28. 28.43 + 18 =
  29. 29.25 + 37 =
  30. 30.383 + 98 =
  31. 31.110 + 18 =
  32. 32.438 + 67 =
  33. 33.107 + 17 =
  34. 34.204 + 27 =
  35. 35.91 + 97 =
  36. 36.26 + 19 =
  37. 37.451 + 57 =
  38. 38.458 + 19 =
  39. 39.115 + 68 =
  40. 40.260 + 17 =

Answer key

  1. 144
  2. 175
  3. 206
  4. 243
  5. 217
  6. 142
  7. 310
  8. 255
  9. 441
  10. 112
  11. 225
  12. 501
  13. 266
  14. 85
  15. 241
  16. 202
  17. 290
  18. 203
  19. 131
  20. 427
  21. 330
  22. 106
  23. 256
  24. 478
  25. 460
  26. 193
  27. 425
  28. 61
  29. 62
  30. 481
  31. 128
  32. 505
  33. 124
  34. 231
  35. 188
  36. 45
  37. 508
  38. 477
  39. 183
  40. 277

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