This math topic covers the practice of identifying and completing equivalent fractions using rectangle-based visual representations. Students are challenged to fill in either missing numerators or denominators to form equivalent fractions as visualized by divided rectangles. There is a progression in difficulty across the problems, as indicated by the inclusion of large numbers and both positive and negative integers. The focus is on developing a solid understanding of how fractions can represent the same value despite having different numerators and denominators. This set of problems forms part of an introductory unit on fractions.