Lily Fincher and Omar Etman show how to play a math memory game. Lily Fincher and Omar Etman show how to play a math memory game. They make two sets of cards depicting something they’ve learned ...
Thirty €1 coins are arranged in a circle on a table. Ten of these coins are fake and a little lighter than the 20 real coins. You don’t know where in the circle the fake coins are, but you have been ...
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