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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 420 · 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. 1.266 + 37 =
  2. 2.446 + 18 =
  3. 3.321 + 29 =
  4. 4.444 + 69 =
  5. 5.109 + 49 =
  6. 6.431 + 17 =
  7. 7.380 + 78 =
  8. 8.297 + 38 =
  9. 9.290 + 49 =
  10. 10.445 + 78 =
  11. 11.191 + 99 =
  12. 12.27 + 88 =
  13. 13.154 + 27 =
  14. 14.139 + 78 =
  15. 15.235 + 18 =
  16. 16.369 + 49 =
  17. 17.361 + 99 =
  18. 18.260 + 27 =
  19. 19.420 + 17 =
  20. 20.211 + 27 =
  21. 21.237 + 88 =
  22. 22.116 + 37 =
  23. 23.337 + 49 =
  24. 24.413 + 69 =
  25. 25.226 + 67 =
  26. 26.356 + 27 =
  27. 27.74 + 67 =
  28. 28.196 + 18 =
  29. 29.151 + 58 =
  30. 30.197 + 19 =
  31. 31.220 + 88 =
  32. 32.155 + 98 =
  33. 33.336 + 99 =
  34. 34.340 + 68 =
  35. 35.425 + 68 =
  36. 36.33 + 98 =
  37. 37.108 + 47 =
  38. 38.324 + 37 =
  39. 39.253 + 19 =
  40. 40.137 + 57 =

Answer key

  1. 303
  2. 464
  3. 350
  4. 513
  5. 158
  6. 448
  7. 458
  8. 335
  9. 339
  10. 523
  11. 290
  12. 115
  13. 181
  14. 217
  15. 253
  16. 418
  17. 460
  18. 287
  19. 437
  20. 238
  21. 325
  22. 153
  23. 386
  24. 482
  25. 293
  26. 383
  27. 141
  28. 214
  29. 209
  30. 216
  31. 308
  32. 253
  33. 435
  34. 408
  35. 493
  36. 131
  37. 155
  38. 361
  39. 272
  40. 194

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