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A collection of some classic Lemmy memes for your enjoyment
This is the coolest trick since I learned about the "quick 20% tip on your tab" method. Take the total bill, move the decimal point one place over to the left, then multiply it by 2 to get 20% gratuity. I will sometimes round down on the change to make it closer to 18%. Also I only really need to do this when I'm drunk and can't maths.
Can we say "commutative" in this case ?
Yeah stuff like that really ain't it. It works in a few use cases, but is objectively wrong and detracts from understanding the topic properly. That's why I teach percentages as the fractions they are. By the time you learn percentages, you already know multiplying fractions is commutative, so the trick still works, and you also understand why.
For those who want to dive deeper into the lake and the wisdom of the panzer: https://en.m.wikipedia.org/wiki/Commutative_property
For real? I've never though of this. This may actually be useful!
% really just means *1/100 - it doesn't matter where you apply that factor:
6% of 50 = 6% * 50 = 6/100 * 50 = 6*50/100 = 6 * 50/100
Where were you when I failed math 101 4 times?
Thanks!
I was probably on a different continent ^^ Also, the biggest problem explaining math is not making it understandable, but having a motivated learner. Most students that have a bad teacher in school, or are somehow not motivated in school to begin with, will also not be motivated to focus on easier explanations. Technically a basic interest in math should be fostered / encouraged in kids from an early age, and at the latest in elementary school. If that does not work out, many students will have a hard time with it.
You are welcome.
maths is the same in both case but I get it, for small numbers this is useful
50*.06 = 50*6*1/100 = .5*6
But you're still just multiplying 5*6 and then moving the decimal point around. So don't sweat it.