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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 329 · 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. 1.31 + 58 =
  2. 2.216 + 47 =
  3. 3.186 + 48 =
  4. 4.252 + 77 =
  5. 5.209 + 79 =
  6. 6.130 + 97 =
  7. 7.329 + 67 =
  8. 8.423 + 29 =
  9. 9.63 + 79 =
  10. 10.245 + 48 =
  11. 11.125 + 18 =
  12. 12.34 + 68 =
  13. 13.352 + 27 =
  14. 14.435 + 28 =
  15. 15.323 + 28 =
  16. 16.216 + 27 =
  17. 17.37 + 39 =
  18. 18.322 + 67 =
  19. 19.288 + 57 =
  20. 20.131 + 69 =
  21. 21.153 + 17 =
  22. 22.170 + 89 =
  23. 23.284 + 59 =
  24. 24.382 + 59 =
  25. 25.481 + 68 =
  26. 26.333 + 49 =
  27. 27.102 + 79 =
  28. 28.152 + 59 =
  29. 29.109 + 58 =
  30. 30.265 + 59 =
  31. 31.387 + 89 =
  32. 32.375 + 97 =
  33. 33.329 + 37 =
  34. 34.253 + 17 =
  35. 35.41 + 17 =
  36. 36.42 + 19 =
  37. 37.76 + 57 =
  38. 38.33 + 57 =
  39. 39.341 + 97 =
  40. 40.446 + 39 =

Answer key

  1. 89
  2. 263
  3. 234
  4. 329
  5. 288
  6. 227
  7. 396
  8. 452
  9. 142
  10. 293
  11. 143
  12. 102
  13. 379
  14. 463
  15. 351
  16. 243
  17. 76
  18. 389
  19. 345
  20. 200
  21. 170
  22. 259
  23. 343
  24. 441
  25. 549
  26. 382
  27. 181
  28. 211
  29. 167
  30. 324
  31. 476
  32. 472
  33. 366
  34. 270
  35. 58
  36. 61
  37. 133
  38. 90
  39. 438
  40. 485

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