A tape diagram is a diagram commonly used to solve comparison mathematical problems. A tape diagram is a rectangular visual model that looks like a piece of tape and is used to help in ratio calculations. A divided bar model, fraction strip, length model, or strip diagram are some other names for it. It is used in mathematics education to solve problems. A tape diagram is a rectangular visual model that looks like a piece of tape and is used to help in ratio calculations. A divided bar model, fraction strip, length model, or strip diagram are some other names for it. It is used to solve word problems in mathematics. issues with words.