Suppose a worm is 7.9 millimeters long. How many centimeters is this?
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The Metric System is based on powers of ten, with the meter being the standard length. Going smaller than a meter, a tenth of a meter is a decimeter, a tenth of a decimeter is a centimeter, a tenth of a centimeter is a millimeter. So a millimeter is a thousandth of a meter, a centimeter is a hundredth of a meter, and a decimeter is a tenth of a meter. Since it takes ten millimeters to make a centimeter, something 7.9 millimeters is .79 centimeters, or .079 decimeters, or .0079 meters.
1 millimeter (mm) equals to about one-tenth of a centimeter (cm), which is 10^-1, according to the metric scale.
= 0.79 cm
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