Have seated learners count the number of boys and girls. Write the numbers above each group, separated by a colon. Explain that this expression identifies the ratio of boys to girls called forward. Return to the term on the board and student comments. Have students identify which, if any, ideas identified what a ratio is.
Guide pupils in defining the term.
Divide class into groups. Direct each group to make a series of six peanut butter and jelly sandwiches, each containing a different ratio of the given spreads. Pupils are to label each ratio. Cut each sandwich into pieces. Conduct a taste test of the preferred ratio.