12 Useful Math Hacks That They Didn’t Teach You In School
After finding these math hacks, I’m convinced that all those years of being forced to struggle through math class really was just a torture ploy created by evil math teachers everywhere. Check out these amazing math tips and you’ll agree! Watch out though, you may just unleash the inner math whiz you never knew was in you…
01. How To Convert Fahrenheit to Celsius
As if it was this simple all along…
Via reddit/u/quaxon
02. How To Multiply Large Numbers In Your Head
Via imgur / MoonnMan
03. How To Multiply By 11
Finally! I can now multiply more than single digits by 11 in my head.
Via WonderHowTo
04. Secret To Remembering The Numbers In Pi
Via 1000lifehacks
05. How To Find Fractions Of Whole Numbers
Via imgur / ayounes
06. How To Figure Out What Day Of The Week Falls On What Date…
You might be confused looking at the picture below, but the math is actually quite simple (albeit a bit elaborate). You’ll need the codes HERE, which will help you master this.
July simply has a code of 5.
20th is 6 because 7 goes into 20 twice, which is 14. 20 – 14 = 6.
2069 is 2 because the leap year code of 2068 is 1 and 2069 is 1 year after, so that’s 2.
The math can be difficult at first because there are a lot of codes, but it works out incredibly well once you pick it up. Here’s a separate example:
January 3, 2014 is a Friday, right?
So, January, according to the table, is 6, and we handle days by using multiples of 7. We don’t need to, so it’s actually just 3 in this case. Next we need to know the closest leap year, which was 2012. That has a year code of 1 and 2013 is 2 years after, so 3 again.
We get 6 + 3 + 3 = 12 – 7 = 5! FRIDAY!
Via lifehacker
07. How to Add And Subtract Fractions
Via imgur / ayounes
08. How To Figure Out Multiples Of Nine
Via Pinterest / Charles Stirton
09. How To Use Your Hands For 5, 6, and 9 Times Tables
Via instructables / misko13
10. How To Figure Out Percentages
Via Twitter / @LifeHacks
11. How To Remember Which Sign Is Greater Than and Which Is Less Than
Via ducksters
12. Use Lines To Multiply
The above is actually a method used often by the Japanese. Here is video demonstrating:
Still don’t have it? Here are three awesome sources that will teach you:
(1) Lifehacker
(2) WikiHow
(3) Magical Maths
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