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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 276 · 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. 1.344 + 19 =
  2. 2.134 + 99 =
  3. 3.300 + 28 =
  4. 4.97 + 38 =
  5. 5.326 + 18 =
  6. 6.382 + 17 =
  7. 7.490 + 48 =
  8. 8.443 + 37 =
  9. 9.431 + 18 =
  10. 10.139 + 69 =
  11. 11.158 + 47 =
  12. 12.165 + 79 =
  13. 13.328 + 67 =
  14. 14.475 + 38 =
  15. 15.73 + 38 =
  16. 16.160 + 59 =
  17. 17.434 + 29 =
  18. 18.324 + 17 =
  19. 19.95 + 88 =
  20. 20.34 + 28 =
  21. 21.90 + 39 =
  22. 22.53 + 59 =
  23. 23.479 + 28 =
  24. 24.275 + 98 =
  25. 25.379 + 39 =
  26. 26.273 + 18 =
  27. 27.62 + 29 =
  28. 28.304 + 29 =
  29. 29.380 + 58 =
  30. 30.52 + 48 =
  31. 31.51 + 77 =
  32. 32.396 + 18 =
  33. 33.291 + 17 =
  34. 34.217 + 97 =
  35. 35.179 + 77 =
  36. 36.151 + 49 =
  37. 37.341 + 28 =
  38. 38.340 + 28 =
  39. 39.328 + 38 =
  40. 40.156 + 78 =

Answer key

  1. 363
  2. 233
  3. 328
  4. 135
  5. 344
  6. 399
  7. 538
  8. 480
  9. 449
  10. 208
  11. 205
  12. 244
  13. 395
  14. 513
  15. 111
  16. 219
  17. 463
  18. 341
  19. 183
  20. 62
  21. 129
  22. 112
  23. 507
  24. 373
  25. 418
  26. 291
  27. 91
  28. 333
  29. 438
  30. 100
  31. 128
  32. 414
  33. 308
  34. 314
  35. 256
  36. 200
  37. 369
  38. 368
  39. 366
  40. 234

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