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
What is the number?
If A:B is : and =, then what is ?
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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value