Rainbow Fraction^® Measuring Cups are a fun 3D way to help young children learn fractions, volume, and capacity. This set of 4 durable measuring cups includes whole, half, third and quarter. Each has a colourful base to help children visualise the fraction, and transparent sides so children can see inside when filling with water, uncooked rice, or other materials. Cups slot neatly and securely into the storage base when not in use.