Students learn that in the metric system, all measures of length are based on meters. For example, a centimeter is 1/100 of a meter. And all measures of weight are based on grams. For example, a kilogram is 1000 grams. And all measures of volume are based on liters. For example, a milliliter is 1/1000 of a liter. Students are then asked to solve problems using conversion factors, such as 4,500 milligrams = ____ grams.