Then start joining up the groups that meet the criteria. Take two pairs, each with half wearing glasses. Join them together as one group, and ask, "What fraction of the people in this group are wearing glasses?" The answer will be 2/4 or 1/2. An assistant can count and check, and another should make a note on the board that 2/4 = 1/2. You are showing equivalent fractions here. Ask another group to join the big one, and ask again, "What fraction of the people in this group are wearing glasses?" Assistants again count and check, and make a record of the fractions on the board. Keep joining groups until all the groups are together. Ask, "What fraction of the people in this group are wearing glasses?" When all the groups have been joined, ask everyone to sit down, and ask your assistants to review the equivalent fractions written on the board.

Other suggestions for forming groups: Ask students to get into groups where 1/3 of the people are wearing watches; where 2/3 of the people are wearing sneakers; where 1/4 of the people are wearing shorts; where 4/5 of the people are wearing pants; where 3/4 of the people are wearing some piece of black clothing; and finally, to find many equivalents for 1, ask for groups of any size where all of the people are students.