There are various methods of subtraction. One method is to use a diagram showing what you start with, what you are taking away, and what you are left with. For example, the problem 5 - 3 might be described with this diagram: Another method to describe and aid in subtraction is to use a number line.
Unit Rates A rate is a ratio that is used to compare different kinds of quantities. A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity. Some common unit rates are miles (or kilometers) per hour, cost per item, earnings per week, etc. In each case the first quantity is related to 1 unit of the second quantity. Return to Top.
1 Unit rate-this is the price you will pay per unit (kWh) of energy, so it can fluctuate depending on how much energy you use. Standing charge-this is a fixed amount that you are charged each day, regardless of how much gas or electricity you use. 2  Unit rate-this is the price you will pay per unit (kWh) of energy, so it can fluctuate depending on how much energy you use.