A set of steps that works every time as long as the steps are carried out correctly.

A way of writing a number as a sum of the values of the digits.

Example: 482 written in expanded form is \(400 + 80 + 2\).

To say which number a given number is closer to. Example: For 182, the number 180 is the closest multiple of 10, and 200 is the closest multiple of 100. We can round 182 to 180 (if rounding to the nearest ten) or 200 (if rounding to the nearest hundred).