# Featured

## Tallest Building in the World (1/4/10 - 1/7/10)

The Burj Khalifa, located in Dubai in the United Arab Emirates, is the tallest building in the world as of January 4, 2010.  It was known as the Burj Dubai (arabic for Dubai Tower), until it almost went bankrupt and was bailed out by the leader of neighboring Abu Dhabi, Khalifa.  The statistics are:

Height: 2,717 feet (828 meters)

Floors: 160

Elevators: 54

## Oragami Cubes to make buildings (12/22)

The Mathletes made six parallelograms out of square colored paper and then connected them using perpendicular lines to make a cube.  During the holiday break, Mathletes should make as many of these cubes as possible and then put them together to make a building .

Happy Holidays.

## Multiplication (12/15 thru 12/21)

We explored multiplication tables with grades 2-5 beyond the standard 10x10 table.  These included powers of two, unit fractions, prime numbers, even numbers, and standard tables up to 30x30. Mathletes should work at their own pace with as many of the tables with which they are comfortable. The answers are provided after each blank table.  Do not print out the entire file as it is 19 pages.

## Doubling, Powers of Two, and Binary Numbers (12-8 thru 12-14)

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This week we practiced doubling numbers from 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, and so on.  The children were able to recite the first ten numbers in this sequence in less than 10 seconds. They should practice that sequence this week; and the ambitious Mathletes should try to double 30 times (see the attached worksheet).

## Building with Bendaroos and More (12-1 thru 12-7)

This week the Mathletes created two and three dimensional figures with Bendaroos (colored wax sticks) including: 2-dimensional - circles, square, equilateral triangle, isosceles triangle, right isosceles triangle, rhombus, pentagon, hexagon, trapezoid, parallelogram,  decagon, and septagon; 3-dimensional - prism, cone, cylinder, and pyramid. See the attached pdf file so your child can practice with these shapes.