7 Useful Math Hacks That They Didn't Teach You In School

1. How To Convert Fahrenheit to Celsius

2. How To Multiply Large Numbers In Your Head

3. How To Multiply By 11

4. Secret To Remembering The Numbers In Pi

5. How To Find Fractions Of Whole Numbers

6. How To Figure Out What Day Of The Week Falls On What Date...

7. How to Add And Subtract Fractions

Source: http://heavenroot.com/48550/8/