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Add the populations of the world's 20 largest cities.

Remember to line up the place values starting with the "one's place."

See attachment.

The Great Wall of China (9-14 thru 9-17)

Great Staircase of China

Please attempt each of the following (EARN MATHLETE DOLLARS):

Prime Factorization - Alien Language

In 1974 Carl Sagan, the famous astronomer, sent a message coded only in prime numbers into outer space.  He believed that the live in outerspace would speak in the universal language of prime numbers.  This message will take 25,000 years to reach the next gallaxy.

We learned how to factor all numbers into their primes using factor trees.