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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 302 · 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. 1.169 + 49 =
  2. 2.32 + 18 =
  3. 3.337 + 38 =
  4. 4.318 + 57 =
  5. 5.110 + 77 =
  6. 6.281 + 98 =
  7. 7.37 + 87 =
  8. 8.53 + 89 =
  9. 9.87 + 17 =
  10. 10.296 + 37 =
  11. 11.152 + 59 =
  12. 12.429 + 77 =
  13. 13.47 + 17 =
  14. 14.407 + 89 =
  15. 15.447 + 47 =
  16. 16.36 + 79 =
  17. 17.157 + 77 =
  18. 18.339 + 98 =
  19. 19.56 + 47 =
  20. 20.428 + 67 =
  21. 21.217 + 58 =
  22. 22.114 + 78 =
  23. 23.337 + 29 =
  24. 24.194 + 47 =
  25. 25.241 + 98 =
  26. 26.404 + 27 =
  27. 27.64 + 67 =
  28. 28.371 + 97 =
  29. 29.31 + 49 =
  30. 30.282 + 27 =
  31. 31.331 + 27 =
  32. 32.416 + 58 =
  33. 33.354 + 99 =
  34. 34.357 + 97 =
  35. 35.145 + 97 =
  36. 36.176 + 39 =
  37. 37.215 + 77 =
  38. 38.452 + 89 =
  39. 39.214 + 38 =
  40. 40.467 + 18 =

Answer key

  1. 218
  2. 50
  3. 375
  4. 375
  5. 187
  6. 379
  7. 124
  8. 142
  9. 104
  10. 333
  11. 211
  12. 506
  13. 64
  14. 496
  15. 494
  16. 115
  17. 234
  18. 437
  19. 103
  20. 495
  21. 275
  22. 192
  23. 366
  24. 241
  25. 339
  26. 431
  27. 131
  28. 468
  29. 80
  30. 309
  31. 358
  32. 474
  33. 453
  34. 454
  35. 242
  36. 215
  37. 292
  38. 541
  39. 252
  40. 485

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