The size of a value using approximate factors of 10.

Examples:

• the order of magnitude of 12 is **1** because it is around 10 in size.

• the order of magnitude of 170 is **2** because it is around 100 in size.

• a kilometer (1000 meters) is three orders of magnitude greater than a meter.

Can also be used to mean "very much" bigger or smaller.

Example: "Sam's tennis game is an order of magnitude better this year"

Below are examples of the order of magnitude of lengths:

See: Scientific Notation