Have them check their estimates by standing along the pieces of string that represent the great white shark. Have students stand shoulder to shoulder again to verify their answer, and repeat the process for the whale shark and the blue whale. In pairs, have students use tape measures taped on the wall to find each other's height. Each student predicts the length of his or her front teeth, assuming that the length of human teeth is in the same proportion to a student's body length as the great white shark's teeth are to its length. After doing this calculation, have students measure the actual lengths of their front teeth with a ruler.
Students can also draw a self-portrait in which their teeth are in proportion to that of a shark.
Have students predict the weight of the whale shark and explain the mathematics that underlies their predictions. The great white shark's teeth may be proportionally more than twice the length of a human being's tooth. Weight should be estimated by comparing the volume of the animals, not simply their relative lengths.