Cubed Root: Find the prime factors of the number under the radical; look for groups of 3 of the same number, like 3 - 2's (cubed root of 8) to take out of the radical; if negative, can factor out the -1
Cute idea... good way to get them to learn square roots without them knowing it because they know the numbers under the post its! It is very inexpensive and not at all time consuming to make. The only problem I can think of with this would be the postit notes loosing their ability to stick onto the clock's face.
The mathematical progressions of phi, square root of phi and square root of 2 as the basic harmonic building block ratios that make up geometry, color and music. Spirals such as phi, the square root of 2, 3 and 5 determine the relationships between the different Platonic Solids. It is an established, longstanding fact that if you take the difference between the base and height measurements of the Pyramid, the pi ratio of 3.14159 is expressed. – David Wilcox, Divine Cosmos
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