Scientific notation is a way to write very large or small numbers in a more compact form. To write a number in scientific notation, you express it as the product of two factors: a decimal number greater than or equal to 1 but less than 10, and a power of 10. For example, 93,000,000 would be written as 9.3 x 107. The power of 10 indicates how many places the decimal is moved. Very small decimals between 0 and 1 use a negative power of 10. For example, 0.00064 would be written as 6.4 x 10-4. Scientific notation makes large and small numbers easier to work with