It is: 1.5*1020
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150 million km in Scientific Notation = 1.5 x 108km
150,000,000 kilometres In scientific notation 1.5*108 kilometers
The way you wrote it is the standard notation. Standard notation means to write the number in its standard form. So, a number such as 150 is simply written as 150 in standard notation. The same applies to decimals.
The way you wrote it is the standard notation. Standard notation means to write the number in its standard form. So, a number such as 150 is simply written as 150 in standard notation. The same applies to decimals.
3/2 = 1.5 = 150%