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Physics help please!?

heres the question:

0.00325x10^-8cm expressed in mm...in order of magnitude form

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Rewrite the number in exponential notation (sometimes called scientific notation). So calculating first to convert to mm by using the unit cancellation .00325 x 108 cm x 10 mm/1 cm = .0325 x 108 mm. Now rewrite the number in exponential notation (one number in front of the decimal) 3.25 x 106 mm. The order of magnitude is the power of 10 which in this case is 106 or 1,000,000 is the order of magnitude.