1. Multiples of 9 works in reverse order.
2. Your hands can tell you multiples of 6, 7, 8, 9
Source: Life Hacker
3. Butterfly method for addition and subtraction
4. Reverse Zorro! Starting at the bottom, draw a line from the 4 to the 24 (4 goes into 24 six times). Draw the line to the 3 (six times three is 18). Draw the top line and write the answer.
Source: T, S, T
5. How to convert Celsius to Fahrenheit and vice versa.
Source: Reddit
6. Know what date will fall on what day in a week anytime. This is Awesome!
Source: Life Hacker
7. Percentages
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