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Sometimes. Scientific notation is used to express very small or very large numbers. If the problem does not involve any such numbers then there is no need for scientific notation.
In using scientific notation, you can use the number with the decimal to solve your problem and then factor in the power after the fact.
Scientists use the scientific method, which is:
the scientific method?
They use the scientific method
scientific meathod
The Scientific Method
scientific meathod
scientific method
scientific method
psychologist do not usually use scientific notation
Mostly the sciences use scientific notation