Steven Strogatz's Opinionator Blog in the New York Times is introducing math one concept at a time. With only four entries so far, it's a great series. The first one introduces numbers with Sesame Street's approach. The second counting and prime numbers by layout out rocks in patterns. The third introduces subtraction which brings up negative numbers and in making that concept concrete he brings up genes and geo-political alliances! The fourth describes division which forces fractions and irrational numbers. Nice stuff.
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