Dan Finkel runs Math for Love with his wife, Katherine Cook. They have developed two games: Tiny Polka Dot: A math-enriched card deck for 3- to 8-year-olds. “It’s really flexible,” Finkel said. You ...

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You could tell by the pile of Styrofoam detritus on the desk that the boy had fun. He didn’t follow the rules, but he probably absorbed some math lessons, whether he wanted to or not. This was Monday ...