1. Multiples of 9 works in reverse order!
2. Multiples of 6, 7, 8, and 9 by hands!
3. Butterfly method for adding and subtracting fractions!
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.
5. Know what date will fall on what day of the week any time ... GENIUS!
6. How to convert Fahrenheit to Celsius and vice versa all in your head!
7. Percentages will never stifle you ever again