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E-learning for Kids
E Learning for Kids: Math: Orange Trees, Olive Trees: 3 Digit Numbers and Fractions
In this interactive site, students practice various skills including finding the total, odd and even numbers, making change, and fractions by helping a farmer pick and sell his oranges and olives.
National Council of Teachers of Mathematics
Nctm: Illuminations: Coin Box
Learn how to count, collect, exchange, and make change for coins by manipulating coins using an array representation.