Submarine sandwiches not only taste good, they also make for great math models. Follow along as Zoe explains how to calculate equivalent fractions, while cutting up a sandwich for herself and her friend. She demonstrates the process using both multiplication and division, emphasizing that the numerator and denominator are treated the same. Be sure to stop and explain to the class that by doing the same thing to each part of the fraction, the value of the fraction does not change. Use this presentation and assessment to supplement you instruction of this key math concept.