# Featured

## Platonic Solids using Four Color Theorem (May 23 - 26)

We explored the five Platonic Solids discovered by Plato in 400 BC.  Each of these polyhedra, the Tetrahedron, Hexahedron, Octahedron, Dodecahedron, and Icosahedron, have congruent regular faces. They are the only polyhedra known that have vertices that are spaced equidistant from each other if inscribed in a sphere.

Incidentally, certain math foundations are offering \$1 million to the mathematician who discovers a sixth such solid.

We built these solids using the rules of coloring maps: no adjacent edges may be the same color.

## Target Number (May 16 through 18)

Preparation: Take a deck of cards and separate out all of the face cards (eliminate

Jacks, Queens, and Kings);You should have 40 remaining cards from Ace to 10 in

four suits.

1. draw 5 cards face up.

## BIZZ BUZZ BANG Multiples of Primes (May 9-12)

BIZZ BUZZ BANG is one of my favorite games to play as it tests your knowledge of multiples with mental math.

BIZZ represents multiples of 3; BUZZ represents multiples of 7; and BANG represents multiples of both 3 and 7 which kids soon learn are multiples of 21. Sitting around a circle, participants count from 1, 2, and then BIZZ (instead of 3), 4, 5, BIZZ (instead of 6), BUZZ (instead of 7), 8, BIZZ (instead of 9), 10, 11, BIZZ (instead of 12), 13, and so on .... but when you get to 21 you say BANG.

## Multiplication Tables: Can you beat your time? (May 2-6)

What do all Mathletes have in common? They exhibit such a positive competitive spirit that they can't wait to beat their time on any activity.

## Mind Benders: Numbers with Clues (April 11-14)

Mind Benders challenge the children to look at a number critically and think of it in the context of certain clues.

For example, the number 26 is best known by English speakers as the number of Letters in the Alphabet. So the clue "26 L in the A" usually triggers the association.  Another easy one is "365 D in a Y."

The first sheet attached are 25 Mind Benders I created with math in mind.  The second one is more challenging and should be attempted with the whole family.  Try not to look at the solutions.