Something that is a billion has base 109. Move one decimal place to the left and write out 1010.
It is 7.0 x 1010 in th short scale, which is mostly used today.
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80 billion in scientific notation is: 8.000000e+10
100 billion in scientific notation is: 1.000000e+11
Four billion in Scientific Notation = 4 x 109
6.32 billion in scientific notation is: 6.32 x 109
It is: 7.5*10^9 = 7.5 billion in scientific notation