Scientific notation is is a great way to shorten long numbers. When you use scientific notation, you are counting the number of place the decimal has to move in order to get the short form of the number. For 1 billion, it would be 1 x 10^9 because the decimal point had to shift 9 times.
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1.0 × 109
1.0 × 109
80 billion in scientific notation is: 8.000000e+10
100 billion in scientific notation is: 1.000000e+11
1 x 1010