A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a:b'.

To simplify a ratio, divide both terms by their greatest common divisor (GCD).

Equivalent ratios are ratios that express the same relationship between quantities, even if the numbers are different.

To find the unit rate, divide the total amount by the number of units. For example, if you spend $40 on 5 pounds of concrete, the unit rate is $40 ÷ 5 = $8 per pound.

The ratio of 5 balloons to 7 balloons is 5:7.

Yes, the ratios 6:10 and 18:30 are equivalent because both simplify to 3:5.

The unit cost per pizza is $97.50 ÷ 15 = $6.50.