A metric prefix is a numerical multiplier that is placed before a basic unit of measure to indicate a specified multiple or fraction of that unit. They range from the smallest, 'yocto' (1 ...

Imperial units and metric conversion Metric units are most often used today, however in some cases imperial units are still used and so it is important to be able to convert between them.

A video and downloadable worksheets about measuring units. They discuss imperial and metric.

And Chafee isn’t the first to suggest the switch. In fact, U.S. politicians and advocates have been trying to introduce the metric system for pretty much as long as the country has existed: none ...