One of the best ways to motivate little kids to learn math (n = 2 admittedly) is to present it as secrets for cheating.
But this shape is unappealingly asymmetrical. So they made a second copy of it, rotated it by 180 degrees, and assembled both into a square.
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Or rather, into a square with a square hole at its center. The whole now consisting of four copies of the original rectangle.
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The area of this new almost-square is 4 times the product of the two unknown numbers. Its side length is their sum.
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