You use a negative exponent. For example, 10-6 is the same as 1 / 106 (one millionth), so you can express 0.0000054 as 5.4 x 10-6.
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In scientific notation, a number is expressed as a decimal multiplied by a power of 10. To determine if a number is big or small, look at the power of 10. If the power is positive, the number is big, and if the power is negative, the number is small. The higher the magnitude of the power, the larger or smaller the number.
3.7*101 Normally a small number like this would not have to be expressed in scientific notation
Nothing is measured in scientific notation. Scientific notation is used merely to represent the result of some measurement - especially when that outcome is a very small or a very large number.
An example of a number in scientific notation would be 3.7 x 10⁶
A small number like this is not normally in scientific notation but just for the exercise it is: 5.109*101