1. Multiples of 9 works in reverse order!
2. Your hands can tell you the future ... okay, fine, it can tell you multiples of 6, 7, 8, and 9!
3. Butterfly method for adding and subtracting fractions! No fighting over pizza anymore!
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. How to convert Fahrenheit to Celsius and vice versa all in your head!
6. Percentages will never stifle you ever again
7. My exact reaction when I actually learned this. Mind. Explosion.
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