6/15/2023 0 Comments What multiplies to 3 and adds to 2![]() ![]() ![]() I know that if I tell you to add 3, I can picture that bag and three extras, this way: The bag is closed, and tied, so I can’t see in, but it doesn’t matter. I don’t know what number you are thinking of, so I just imagine a bag with that number of marbles or candies in it. Think of a number, do some arithmetic, tell me your result, and I can instantly say what number you started with.įourth graders love these tricks! Most of them (and even some younger children) are also ready to understand how they work and even to learn to make up their own tricks! Without the high-school notation, what they are learning is the beginnings of algebra! The trick.Think of a number (but don’t tell me), do some arithmetic with that number, and I can predict your result.And understanding a trick well enough lets children make up their own tricks. But understanding how the trick works is good mathematical, often algebraic, learning. The fun, all by itself, is valuable, but is not mathematics.
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