150,000,000 kilometers
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150 million = 150,000,000
1.5*108 kilometers
There are eight zeros in 150 million kilometers, as it is written as 150,000,000 kilometers. This is the same as 1.5 x 10^8 kilometers in scientific notation.
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.