## Use Ratios

### Ratios: Learn

Ratios tell how one number is related to another number.

A ratio may be written as in colon notation (A:B) or in fraction notation (A/B) or using words ("A to B").

Example: A ratio of 1:5 says that the second number is five times as large as the first.

Example: A ratio of 2:5 says that for every 2 of the first number, there are 5 of the second.

The following steps will allow determination of a number when one number and the ratio between the numbers is given.

Example: Determine the value of B if A=6 with the ratio of A:B = 2:5

• Determine how many times the number A is divisible by the corresponding part of the ratio. (6/2=3)
• Multiply this number by the part of the ratio representing B (3*5=15)
• Therefore if the ratio of A:B is 2:5 and A=6 then B=15

### Ratios: Practice

#### What is the number?

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If A:B is : and =, then what is ?

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