Saturday, 19 October 2013

What fraction of the earth is land?

What fraction of the earth is dry land?
I posed this question to Imogen and Jemima.
The girls began tackling the task, by looking at the globe and the continents.

 Next, they found the area of each continent and the area of the earth.
The internet was used, but an atlas could also be used.

The fraction was composed:
Total area of the continents/area of the earth
To make it slightly easier to simplify the fractions 
we rounded each figure to the nearest hundred.

After each fraction simplification, we rounded up or down to the nearest hundred. We kept repeating the process until the fraction could no longer be simplified.

And our answer is...
The earth is 3/10 land and 7/10 water.

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