含有计量单位名称的数又叫做名数。例如,3小时,8米5分米等。在“3小时”这个名数中,“3”是数,“小时”是计量单位名称。我们不能单单把“小时”说成为“名数”。只含有一个计量单位名称的名数叫做单名数。例如,7丈、10平方厘米、2斤等。含有两个(或两个以上)的同类量的计量单位名称的名数叫做复名数。例如:5亩6分、2元4角5分、8立方米24立方分米等。在生产和生活中,人们经常要将名数互化。如通常有把高级单位的单名数化为低级 The number of units that contain units of measure is also called names. For example, 3 hours, 8 meters and 5 meters. In the “3 hours” this name, “3” is the number, “hour” is the name of the unit of measurement. We can not simply say “hours” as “names.” A name that contains only one unit of measure is called a single name. For example, 7 feet, 10 square centimeters, 2 pounds and so on. Contains two (or two or more) of the same amount of name of the unit of measure is called the second name. For example: 5 acres 6 points, 2 yuan 4 corner 5 points, 8 cubic meters 24 cubic meters and so on. In production and in life, people often want to name each other. As usual, we have to lower the number of single names of senior units