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In February 2010, the population of the world was
approximately 6 800 000 000 people.
Another way of writing this number is
a.6.8 × 10^8
b.6.8 × 10^9
c.68 × 10^9
d. 68 × 10^10
The correct choice is 'B'. The correct exponent is +9.
In order to change 6.8 into 6,800,000,000 you have to move the decimal point 9 places in the LARGER direction.
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