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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 468 · 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. 1.451 + 29 =
  2. 2.413 + 47 =
  3. 3.368 + 67 =
  4. 4.212 + 59 =
  5. 5.379 + 19 =
  6. 6.121 + 77 =
  7. 7.204 + 98 =
  8. 8.85 + 38 =
  9. 9.92 + 58 =
  10. 10.432 + 79 =
  11. 11.478 + 39 =
  12. 12.421 + 87 =
  13. 13.300 + 89 =
  14. 14.77 + 69 =
  15. 15.387 + 67 =
  16. 16.67 + 18 =
  17. 17.32 + 77 =
  18. 18.310 + 37 =
  19. 19.277 + 59 =
  20. 20.173 + 37 =
  21. 21.227 + 47 =
  22. 22.118 + 38 =
  23. 23.329 + 88 =
  24. 24.212 + 47 =
  25. 25.382 + 17 =
  26. 26.281 + 28 =
  27. 27.64 + 49 =
  28. 28.425 + 19 =
  29. 29.211 + 37 =
  30. 30.240 + 58 =
  31. 31.331 + 57 =
  32. 32.320 + 27 =
  33. 33.184 + 27 =
  34. 34.242 + 47 =
  35. 35.132 + 37 =
  36. 36.352 + 29 =
  37. 37.319 + 87 =
  38. 38.292 + 27 =
  39. 39.116 + 77 =
  40. 40.154 + 67 =

Answer key

  1. 480
  2. 460
  3. 435
  4. 271
  5. 398
  6. 198
  7. 302
  8. 123
  9. 150
  10. 511
  11. 517
  12. 508
  13. 389
  14. 146
  15. 454
  16. 85
  17. 109
  18. 347
  19. 336
  20. 210
  21. 274
  22. 156
  23. 417
  24. 259
  25. 399
  26. 309
  27. 113
  28. 444
  29. 248
  30. 298
  31. 388
  32. 347
  33. 211
  34. 289
  35. 169
  36. 381
  37. 406
  38. 319
  39. 193
  40. 221

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