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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 674 · 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. 1.28 + 28 =
  2. 2.39 + 69 =
  3. 3.277 + 98 =
  4. 4.240 + 97 =
  5. 5.374 + 18 =
  6. 6.414 + 89 =
  7. 7.76 + 68 =
  8. 8.54 + 79 =
  9. 9.381 + 59 =
  10. 10.401 + 17 =
  11. 11.434 + 29 =
  12. 12.114 + 38 =
  13. 13.419 + 58 =
  14. 14.44 + 59 =
  15. 15.240 + 37 =
  16. 16.243 + 58 =
  17. 17.474 + 67 =
  18. 18.240 + 47 =
  19. 19.471 + 18 =
  20. 20.57 + 39 =
  21. 21.335 + 77 =
  22. 22.40 + 78 =
  23. 23.46 + 27 =
  24. 24.54 + 28 =
  25. 25.464 + 69 =
  26. 26.332 + 97 =
  27. 27.156 + 67 =
  28. 28.42 + 37 =
  29. 29.471 + 68 =
  30. 30.408 + 88 =
  31. 31.127 + 89 =
  32. 32.419 + 89 =
  33. 33.229 + 67 =
  34. 34.470 + 29 =
  35. 35.155 + 69 =
  36. 36.276 + 17 =
  37. 37.190 + 79 =
  38. 38.162 + 27 =
  39. 39.212 + 57 =
  40. 40.485 + 27 =

Answer key

  1. 56
  2. 108
  3. 375
  4. 337
  5. 392
  6. 503
  7. 144
  8. 133
  9. 440
  10. 418
  11. 463
  12. 152
  13. 477
  14. 103
  15. 277
  16. 301
  17. 541
  18. 287
  19. 489
  20. 96
  21. 412
  22. 118
  23. 73
  24. 82
  25. 533
  26. 429
  27. 223
  28. 79
  29. 539
  30. 496
  31. 216
  32. 508
  33. 296
  34. 499
  35. 224
  36. 293
  37. 269
  38. 189
  39. 269
  40. 512

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