Explain why you'll never have to carry a 9 when doing long multiplication

@christianp 9x9=81 (carries the 8) and even if you carry 8 into another 9x9 column, you get 89 (still only carries 8) ? 🤔

@christianp You can carry a 9 - or 10 or 11 or any higher number - if you're doing really large multiplications.

And anyway we have computers for that.

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