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Rounding error. Dividing 10 by 3 gives you exactly 3â…“, so 3â…“ times 3 equals exactly 10.

The problem comes when representing â…“ as a decimal number. Dividing 10 by 3 gives us 3.333..., not 3.333000. â…“ as a decimal number repeats infinitely.

Using calculator, we cannot get 10 when we add 3.3333...
together 3 times.