yea but all they have to do is apply the formula which they get given.
This is the bit that I hate about streaming the math so that people can pick easy things, did not learn the basics and forget it all by the time they get out of schools. At University some students keep pestering others, friends, ... to get help on the basics that they should have had. Psychology students are full of people who did not do proper math then suddenly asked to learn statistics. Some giggling girls actually find a boy friend who is good at what they need to help them scrape through (then probably dump the boyfriend later). I could not believe that real teachers still teach multiply of fraction the way it was taught 50 years ago! They teach kids something like this
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Then they simply say 4/3 is the reciprocal of 3/4 and stop at that. So, why is it so? Why just time with the reciprocal? If ask "what is the reciprocal?", they just say "It is what you time with the original fraction, you get the result of 1". What the hell is that kind of teaching? It's full of holes. I used to spend many hours thinking about this when I was young and worked out all by myself why it worked that way. I recently watch some video clips on this (by professional teachers), and they still do same thing.
Any one out there can confirm this? I wonder if teachers still taught you guys out there this same thing without proving why it worked? They gave you formula to use but did not bother prove the formula to be correct.