Mr. and Mrs. Happychuck had a healthy baby boy named Chuck who weighed 7.5 pounds at birth. At the end of 4 months, the baby weighed 13.5 pounds. What is Chuck's weight age ratio at 4 months? (Call on a student to answer; the ratio is 13.5 pounds to 4 months or (13.5)/4. It is important to make sure that the students always mention the units involved, in this case pounds and months. Then ask the students to calculate the rate of change of Chuck's weight, that is, how much he gained per month. Ask a volunteer to go to the board and do the work.
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