It must be less than 10.
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No, the number is not written in scientific notation. In scientific notation, the coefficient should be greater than or equal to 1 and less than 10. Therefore, 0.15 x 10^4 would be written as 1.5 x 10^3 in scientific notation.
Because less digits are needed in scientific notation to represent very large numbers.
When the value that you are representing in scientific notation is less than 1, or greater than or equal to 10.
Yes it can be converted into scientific notation thus using less digits but retaining its original value
Scientific notation takes up much less space ! consider the number 1,000,000,000,000,000,000 - it's much easier to write it as 1018 and it takes up less space on the page !