Mental Math Trick

Algebra Level pending

You can change a regular multiplication problem into a binomial multiplication problem to do mental math faster:

\( 49 \times 47 \\ (50-1) \times (50-3) \\ 2500 - 50 - 150 + 3 \\ 2503 - 200 \\ 2303 \)

Try it yourself: what's \( 92 \times 98 ?\) (No paper or calculators allowed!)

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