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# 12 useful math hacks that they didn’t teach you in school

12 useful math hacks that they didn’t teach you in school

1. How To Convert Fahrenheit to Celsius

As if it was this simple all along…

2. How To Multiply Large Numbers In Your Head

Who knew?

3. How To Multiply By 11

Finally! I can now multiply more than single digits by 11 in my head.

4. Secret To Remembering The Numbers In Pi

Also a cool party trick.

5. How To Find Fractions Of Whole Numbers

6. 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!

7. How to Add And Subtract Fractions

8. How To Figure Out Multiples Of Nine

Just count up in the tens column and down in the ones column.

9. How To Use Your Hands For 5, 6, and 9 Times Tables

10. How To Figure Out Percentages

11. How To Remember Which Sign Is Greater Than and Which Is Less Than

Alligator always eats the bigger number!

12. Use Lines To Multiply

Still don’t have it? Here are three awesome sources that will teach you:

(1) Lifehacker
(2) WikiHow
(3) Magical Maths

### cone

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