Ratio Help Page

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What are ratios? They tell us how one number is related to another number.

How do you write one? They may be written A:B, A/B, or A to B.

What does it mean? In the ration 1:10, the second number is ten times as large as the first number.

How can I find the value of a variable when one variable and the ratio is given? Check the example below.

Example: What is the value of B if A = 4 and the ratio of A:B is 2:5?

• How many times is the number A(4) divisible by the corresponding part of the ratio? 4 divided by 2 = 2
• Multiply your answer by the part of the ratio that stands for B(5). 2 times 5 =10
• So, if the ratio of A:B is 2:5 and A=4, then B=10

Here are some links to some Ratio Practice Exercises.
http://math.rice.edu/~lanius/proportions/
http://www.math.com/schools/subject1/practice/S1U2L1/S1U2L1Pract.html
http://www.aaastudy.com/rat62ax2.htm#section2

 

 

 

This page was created by Tracy Philpot