Because conversion in the decimal system is based on multiplication (or division) by powers of ten. Each multiplication by ten is equivalent to moving the decimal point one place to the right.
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The United States is the only industrialized nation in the world that does not use the metric system of measurement as its primary system. The country mainly relies on the customary system based on inches, feet, pounds, and gallons for measurements.
Bore and stroke are typically given in millimeters in the metric system. Bore refers to the diameter of the cylinder, while stroke refers to the distance the piston moves from top dead center to bottom dead center in the cylinder.
When you calculate how many metres are in a certain number of kilometres, you multiply - thus moving the decimal point to the right. For example: 3.8873 kilometres is equal to 3.8873 x 1000 = 3887.3 metres.
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To convert micrometers to millimeters, you need to move the decimal point 3 places to the left because 1 millimeter is equal to 1000 micrometers. So, the decimal moves 3 places to the left.