How to Quickly Multiply Any Number Between 10 and 20 I The Great Courses

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If you know your multiplication tables up to 10, you already know your multiplication tables up to 20—you just haven't realized it yet. In less than five minutes, you can unlock the simple math tricks to put together dozens of two-digit multiplication problems in no time flat. Reach into your top hat and pull out some mathemagic.

Presented by Arthur Benjamin
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#MathTricks #Multiplication #Mathemagician