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To those who still think 1+2x3=9
Authored by: jlaro on Sep 27, '05 03:50:37PM

Those who think 1+2x3=9 probably hated math in school because they thought it was a purely abstract subject. Well, maths ARE the real world.

If I say: 1$ + 2 x 3$, now what? Would you pay 7$ or 9$ for those three items? 1$ + 3$ + 3$, right? "No, no" you say, "it's 1$ + 2$ x 3". Ah, you mean 1$ + 2$ + 2$ + 2$ ? How much change did you get on your 10$ bill exactly? "Ah shoot" you correct again, "I bought a one-dollar item and a two-dollar item, three times". OK I get it, like (1$ + 2$) x 3, or 3 x (1$ + 2$) or 3 x 1$ + 3 x 2$ ? (this is called distributivity) Now yes, you spent 9$, but you end up with three one-dollar items and three two-dollar items. (1 + 2) x 3 is not at all the same than 1 + 2 x 3.

Got it? Class dismissed.

Next workshop: Discovery of a basic calculator's mysterious M keys. Cost: 100 + 2 x 10 + 5. Use your preferred device to calculate and make the check payable to me.

JL



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