One of the best ways to motivate little kids to learn math (n = 2 admittedly) is to present it as secrets for cheating.
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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The crucial final point is that the side length of the missing square at its center is the difference between the two unknown numbers.
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