Mental Calculation of Ratios and Averages A ratio is a comparison of two numbers that indicates how one number relates to the other. For example, if you...
A ratio is a comparison of two numbers that indicates how one number relates to the other. For example, if you have 5 apples and 3 oranges, the ratio of apples to oranges is 5:3. The ratio tells you that there are 5 apples for every 3 oranges.
The average is the sum of two or more numbers divided by the number of numbers. For example, if you have the numbers 5, 7, and 10, the average is (5 + 7 + 10) / 3 = 7. The average tells you that the sum of the numbers is 15 divided by 3, which is 7.
When you have ratios and averages, you can often simplify them by dividing or multiplying the ratios or the averages. For example, if you have the ratios 5:3 and 10:6, you can simplify them to 1:2 by dividing both ratios by 5.
This skill is important for solving arithmetic speed tests because it allows you to quickly compare and understand ratios and averages in your head. By being able to simplify ratios and averages, you can quickly find the answers to math problems