Let's cross out some of these zeros to make this easier to read. We can do this because they are both multiples of 10 and as long as we cross out the same amount of 0's in both numbers.
70,000,000
7,000,000,000
So our new question is, "What percentage is 7 of 700?"
To figure this out, we need to divide 7 by 700.
We get 0.01. To turn this into a percentage, move the decimal over two places to the right, and add a percent!
1%
So 70,000,000 is 1% of 7,000,000,000.