Convert: Change
Mass: A measure of how much matter is in an object. Commonly measured by weight.
Origin: The coordinate (0,0)
Volume: The amount of 3D shape a shape takes up
Substitute: putting numbers where letters are - replacing numbers into a formula.
Speed: How fast something is moving. Measured as distance travelled per unit of time.
Density: A measure of how much matter is in a certain volume.
Exchange Rates: is the rate at which the money of money country can be exchanged for the money of another country.