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by chenelle00
Fri Oct 02, 2009 7:58 pm
Forum: Pre-Algebra
Topic: Estimate number of grains of sand in Sarah Desert?
Replies: 1
Views: 1929

Estimate number of grains of sand in Sarah Desert?

The Sarhara Desert covers about 8.3 x 10^13 square feet.
The average depth of the sand in the Sahara Desert is 200ft
A grain of sand has a volume of approximately 1.3 x 10^-9 cubic feet.

I'm told the correct answer is 10^25 but I don't know how to get that answer.

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