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Posts: 367 | Thanked: 1,442 times | Joined on Feb 2015
#39
Originally Posted by pichlo View Post
With all due respect, madam or sir, I believe it was you who did.

The common denominator of 21 and 9 is... 3! Hence 21:9 = 7:3. QED.
common denominator is a term applied to 2 different fractions, i.e. 21:9 and 16:9, so you can compare them.

PS I can't believe I write this. It's what scholars learn when they are 10 or 11 y.o. at least where I live.
 

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