GED Math Skill: estimating

Sharon is planning a graduation meal for her son. She plans on serving ham. The butcher told her that she should figure 1/2 pound per person. If there will be 67 people at the party, about how big (pounds) should the ham be?

answer: 67 x 1/2 = 33 1/2
about how many indicated estimation, so to be on the safe side, Sharon should get at least 34 pounds.