Here are

**8 most useful math hacks**that you didn’t learn in the school and which will change your life. With these math tricks, surprise them as you whiz through those hard to tackle calculations all done in your head. I am convinced that I am not as bad at math as I used to think I was since I knew about these math hacks.

Let us take a look at how easy math could be with these tricks at your disposal…

### 01. How To Convert Fahrenheit to Celsius

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 Figure Out What Day Of The Week Falls On What Date…

Via lifehacker

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!

### 06. How to Add And Subtract Fractions

Via imgur / ayounes

### 07. How To Figure Out Multiples Of Nine

Count up in the tens column and down in the ones column.Via Pinterest / Charles Stirton.