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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 800 · 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. 1.311 + 59 =
  2. 2.71 + 47 =
  3. 3.240 + 77 =
  4. 4.426 + 78 =
  5. 5.417 + 29 =
  6. 6.354 + 47 =
  7. 7.310 + 27 =
  8. 8.280 + 98 =
  9. 9.445 + 57 =
  10. 10.388 + 27 =
  11. 11.312 + 28 =
  12. 12.380 + 69 =
  13. 13.212 + 27 =
  14. 14.440 + 49 =
  15. 15.226 + 87 =
  16. 16.294 + 67 =
  17. 17.449 + 78 =
  18. 18.192 + 29 =
  19. 19.107 + 19 =
  20. 20.207 + 67 =
  21. 21.277 + 49 =
  22. 22.263 + 47 =
  23. 23.420 + 68 =
  24. 24.44 + 18 =
  25. 25.354 + 69 =
  26. 26.403 + 99 =
  27. 27.63 + 87 =
  28. 28.172 + 78 =
  29. 29.302 + 17 =
  30. 30.460 + 97 =
  31. 31.195 + 37 =
  32. 32.155 + 47 =
  33. 33.358 + 18 =
  34. 34.276 + 69 =
  35. 35.34 + 29 =
  36. 36.477 + 89 =
  37. 37.362 + 48 =
  38. 38.221 + 47 =
  39. 39.35 + 48 =
  40. 40.403 + 69 =

Answer key

  1. 370
  2. 118
  3. 317
  4. 504
  5. 446
  6. 401
  7. 337
  8. 378
  9. 502
  10. 415
  11. 340
  12. 449
  13. 239
  14. 489
  15. 313
  16. 361
  17. 527
  18. 221
  19. 126
  20. 274
  21. 326
  22. 310
  23. 488
  24. 62
  25. 423
  26. 502
  27. 150
  28. 250
  29. 319
  30. 557
  31. 232
  32. 202
  33. 376
  34. 345
  35. 63
  36. 566
  37. 410
  38. 268
  39. 83
  40. 472

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