1. Locate the centimeters on the ruler. Many rulers have two sets of numbers. You are looking for the metric set of numbers. This side of the ruler will be ... 2. Understand the relationship between a millimeter and a centimeter. If you look closely at your ruler, you will see that each centimeter is divided into 10 ... 3. Align the edge of the object with the first centimeter line on the ruler. Note that the edge of the physical ruler often does not align with the beginning ...
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