An allowance tracker app we use with the 9YO has a set of stay-at-home activities including one that is allegedly about learning how compound interest works, with the classic example of starting with a penny and doubling it every day.

I'm actually impressed that they snuck in a lesson on exponential/geometric growth at a time when the understanding is critical, but using a non-anxiety-inducing context.

@KelsonV I think I first learned about it via the George Gamow book, "One, Two, Three ... Infinity" via the grains of rice on a chessboard (start with one grain on the first chessboard square, double it for each subsequent square).

@sohkamyung Oh, that's a good way to do it: hands on with something you have a lot of, so you can actually *see* the increase square by square!

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