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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 731 · 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. 1.331 + 29 =
  2. 2.95 + 59 =
  3. 3.420 + 48 =
  4. 4.63 + 69 =
  5. 5.393 + 57 =
  6. 6.304 + 89 =
  7. 7.141 + 78 =
  8. 8.189 + 59 =
  9. 9.42 + 29 =
  10. 10.448 + 38 =
  11. 11.340 + 79 =
  12. 12.222 + 17 =
  13. 13.443 + 18 =
  14. 14.216 + 97 =
  15. 15.257 + 97 =
  16. 16.31 + 29 =
  17. 17.111 + 59 =
  18. 18.369 + 98 =
  19. 19.265 + 88 =
  20. 20.78 + 37 =
  21. 21.367 + 28 =
  22. 22.115 + 87 =
  23. 23.360 + 18 =
  24. 24.187 + 78 =
  25. 25.46 + 38 =
  26. 26.228 + 57 =
  27. 27.154 + 89 =
  28. 28.224 + 17 =
  29. 29.112 + 37 =
  30. 30.336 + 59 =
  31. 31.96 + 39 =
  32. 32.447 + 37 =
  33. 33.453 + 77 =
  34. 34.318 + 68 =
  35. 35.306 + 48 =
  36. 36.128 + 38 =
  37. 37.431 + 77 =
  38. 38.110 + 78 =
  39. 39.428 + 17 =
  40. 40.472 + 37 =

Answer key

  1. 360
  2. 154
  3. 468
  4. 132
  5. 450
  6. 393
  7. 219
  8. 248
  9. 71
  10. 486
  11. 419
  12. 239
  13. 461
  14. 313
  15. 354
  16. 60
  17. 170
  18. 467
  19. 353
  20. 115
  21. 395
  22. 202
  23. 378
  24. 265
  25. 84
  26. 285
  27. 243
  28. 241
  29. 149
  30. 395
  31. 135
  32. 484
  33. 530
  34. 386
  35. 354
  36. 166
  37. 508
  38. 188
  39. 445
  40. 509

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