I consider myself pretty conversant in metric units. I know that 20 kilograms is 44 pounds (double it and add 10%) and that five kilometers is a little over three miles (I’ve, uh, run a lot of 5Ks).

What gas mark is 180 or 200 degrees Celsius? The gas mark is a temperature scale used on gas cookers and gas ovens in the UK, Ireland and some Commonwealth countries. If you own a gas cooker or gas ...

Students often struggle with temperature conversions in science courses due to time constraints. A simplified approximation method offers a solution by using basic arithmetic: double Celsius and add ...