Unique, visual approach to teaching volume and fractions. Measurement and fractions are commonly cited as two of the hardest concepts to teach in math. Our Rainbow Fraction Measuring Cups provide a unique 3D representation that helps connect volume and fractions. Children see and experience measuring, comparing volumes and capacity, and learning fractional relationships. Transparent, color-coded cups match the Rainbow Fraction Teaching System Handy storage container keeps measuring cups all in one place. Subject Area: Mathematics; Specific Subject: Measurements & Fractions; Age Recommendation: Ages 3 and Up; Grades: Pre-K to K.