# Featured

## Four Color Map Theorem (March 28-31)

Francis Guthrie, a 21yearold mathematics student at University College in London, was mapping the counties of England in 1852 when he noticed that he only needed four colors for the map. He asked his younger brother, Frederick Guthrie, if this was true for any map. Frederick took the problem to his professor, Augustus de Morgan.

## Coordinate Plane Graph Pictures (March 21-24)

Mathletes had fun this week with their coordinate pictures. We introduced all four quadrants in the coordinate plane.

## Sir Cumference and the Dragon of Pi (March 14-17)

Pi day is upon us again as Monday was March 14. It is called Pi day because the number Pi starts with 3.14. We challenged the Mathletes to think of what 2Pi day would be; calculating 6.28, they say, "June 28." Then 3Pi day is fun; 9.42 gets them thinking about 30 days in September, so some of them go into October 12th. A silly past-time but fun.

## Sum of Consecutive Integers (March 7-10)

<!--StartFragment-->

Which natural numbers can be written as the sum of two or more positive consecutive integers? This exercise has challenged mathematicians for centuries and clear patterns have formed. However, only recently, in 1997, did was a proof developed for why powers of two such as 1,2,4,8,16,32...... could never be a sum of consecutive integers.

## Paper Tower (February 28th to March 3rd)

<!--StartFragment-->

**PAPER TOWER CONTEST **