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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 488 · 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. 1.129 + 79 =
  2. 2.40 + 59 =
  3. 3.209 + 88 =
  4. 4.452 + 29 =
  5. 5.488 + 27 =
  6. 6.484 + 68 =
  7. 7.140 + 57 =
  8. 8.357 + 39 =
  9. 9.206 + 97 =
  10. 10.401 + 97 =
  11. 11.173 + 78 =
  12. 12.43 + 57 =
  13. 13.137 + 17 =
  14. 14.358 + 67 =
  15. 15.311 + 37 =
  16. 16.456 + 58 =
  17. 17.271 + 99 =
  18. 18.146 + 59 =
  19. 19.90 + 89 =
  20. 20.421 + 68 =
  21. 21.157 + 57 =
  22. 22.102 + 89 =
  23. 23.111 + 78 =
  24. 24.381 + 39 =
  25. 25.416 + 98 =
  26. 26.294 + 97 =
  27. 27.70 + 38 =
  28. 28.150 + 88 =
  29. 29.396 + 58 =
  30. 30.351 + 79 =
  31. 31.185 + 88 =
  32. 32.193 + 67 =
  33. 33.160 + 88 =
  34. 34.69 + 39 =
  35. 35.82 + 68 =
  36. 36.110 + 67 =
  37. 37.333 + 19 =
  38. 38.395 + 18 =
  39. 39.57 + 98 =
  40. 40.276 + 28 =

Answer key

  1. 208
  2. 99
  3. 297
  4. 481
  5. 515
  6. 552
  7. 197
  8. 396
  9. 303
  10. 498
  11. 251
  12. 100
  13. 154
  14. 425
  15. 348
  16. 514
  17. 370
  18. 205
  19. 179
  20. 489
  21. 214
  22. 191
  23. 189
  24. 420
  25. 514
  26. 391
  27. 108
  28. 238
  29. 454
  30. 430
  31. 273
  32. 260
  33. 248
  34. 108
  35. 150
  36. 177
  37. 352
  38. 413
  39. 155
  40. 304

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