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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 746 · 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. 1.310 + 57 =
  2. 2.147 + 69 =
  3. 3.367 + 67 =
  4. 4.399 + 47 =
  5. 5.81 + 97 =
  6. 6.215 + 69 =
  7. 7.294 + 97 =
  8. 8.216 + 38 =
  9. 9.181 + 29 =
  10. 10.321 + 87 =
  11. 11.487 + 39 =
  12. 12.148 + 39 =
  13. 13.463 + 77 =
  14. 14.192 + 27 =
  15. 15.32 + 99 =
  16. 16.29 + 18 =
  17. 17.34 + 38 =
  18. 18.139 + 97 =
  19. 19.194 + 18 =
  20. 20.153 + 28 =
  21. 21.155 + 48 =
  22. 22.58 + 29 =
  23. 23.293 + 37 =
  24. 24.236 + 87 =
  25. 25.96 + 87 =
  26. 26.231 + 47 =
  27. 27.147 + 78 =
  28. 28.249 + 57 =
  29. 29.35 + 78 =
  30. 30.115 + 89 =
  31. 31.452 + 47 =
  32. 32.487 + 57 =
  33. 33.144 + 29 =
  34. 34.284 + 88 =
  35. 35.128 + 59 =
  36. 36.129 + 79 =
  37. 37.370 + 97 =
  38. 38.242 + 97 =
  39. 39.76 + 89 =
  40. 40.217 + 49 =

Answer key

  1. 367
  2. 216
  3. 434
  4. 446
  5. 178
  6. 284
  7. 391
  8. 254
  9. 210
  10. 408
  11. 526
  12. 187
  13. 540
  14. 219
  15. 131
  16. 47
  17. 72
  18. 236
  19. 212
  20. 181
  21. 203
  22. 87
  23. 330
  24. 323
  25. 183
  26. 278
  27. 225
  28. 306
  29. 113
  30. 204
  31. 499
  32. 544
  33. 173
  34. 372
  35. 187
  36. 208
  37. 467
  38. 339
  39. 165
  40. 266

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