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When students need a mental math jolt, try this one. Ask them to explain how this works..:)
Jerry On 4/25/13, PedagoNet wrote: > When students need a mental math jolt, try this one. > Ask them to explain how this works..:)

Let the three numbers be a, b, and c. Do the math in terms of a, b, and c, and the result becomes clear.

Seems to me we could use the entire deck, with face cards as ten, and permitting duplicates.
Apr 25, 2013


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