### 1. How to Multiply Large Numbers in Your Head

### 2. How to Figure Out Multiples of 9

### 3. Multiples Of 9 Work In Reverse Order

### 4. How To Add and Subtract Fractions

### 5. How to Multiply by 11

### 6. Figuring Percentages

### 7. How to Find Fractions of Whole Numbers

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8. Convert Fahrenheit to Celsius

### 9. And The Most Important Tip (!)

source:http://www.whydontyoutrythis.com/2015/03/if-you-learned-these-simple-tricks-you-would-never-be-bad-at-math.html

Nowadays, math skills
are on a steady decline because almost everyone has a calculator on
their phone. But there was a time when we didn't all have calculators in
our pockets, when math was actually something you had to learn.
See below a list of 9 simple tricks you can use to figure out complex
math problems without a calculator. These tricks will definitely amaze
or even shock your friends!
1. How to Multiply Large Numbers in Your Head Source: http://www.whydontyoutrythis.com/2015/03/if-you-learned-these-simple-tricks-you-would-never-be-bad-at-math.html