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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 393 · 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. 1.162 + 39 =
  2. 2.124 + 19 =
  3. 3.376 + 18 =
  4. 4.373 + 38 =
  5. 5.331 + 49 =
  6. 6.338 + 47 =
  7. 7.491 + 97 =
  8. 8.321 + 97 =
  9. 9.316 + 88 =
  10. 10.358 + 89 =
  11. 11.218 + 39 =
  12. 12.262 + 37 =
  13. 13.175 + 38 =
  14. 14.306 + 17 =
  15. 15.186 + 88 =
  16. 16.310 + 19 =
  17. 17.122 + 19 =
  18. 18.108 + 39 =
  19. 19.354 + 59 =
  20. 20.103 + 47 =
  21. 21.146 + 87 =
  22. 22.47 + 97 =
  23. 23.444 + 88 =
  24. 24.174 + 37 =
  25. 25.449 + 89 =
  26. 26.162 + 39 =
  27. 27.41 + 29 =
  28. 28.199 + 69 =
  29. 29.286 + 98 =
  30. 30.104 + 37 =
  31. 31.185 + 99 =
  32. 32.373 + 19 =
  33. 33.486 + 97 =
  34. 34.257 + 88 =
  35. 35.66 + 87 =
  36. 36.289 + 57 =
  37. 37.68 + 69 =
  38. 38.249 + 48 =
  39. 39.361 + 17 =
  40. 40.275 + 29 =

Answer key

  1. 201
  2. 143
  3. 394
  4. 411
  5. 380
  6. 385
  7. 588
  8. 418
  9. 404
  10. 447
  11. 257
  12. 299
  13. 213
  14. 323
  15. 274
  16. 329
  17. 141
  18. 147
  19. 413
  20. 150
  21. 233
  22. 144
  23. 532
  24. 211
  25. 538
  26. 201
  27. 70
  28. 268
  29. 384
  30. 141
  31. 284
  32. 392
  33. 583
  34. 345
  35. 153
  36. 346
  37. 137
  38. 297
  39. 378
  40. 304

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