Rates and Ratio Review

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

Front

How do you calculate the cost per item?

Back

To find the cost per item, divide the total cost by the number of items. For example, if a pizza costs $12 and has 8 slices, the cost per slice is $12 ÷ 8 = $1.50.

Front

What does it mean if one centimeter on a map represents 25 miles?

Back

It means that for every 1 centimeter measured on the map, it corresponds to 25 actual miles in real life.

Front

How do you find the total number of students who take the bus?

Back

To find the total number of students who take the bus, multiply the total number of students by the percentage that takes the bus. For example, if there are 50 students and 40% take the bus, then 50 x 0.40 = 20 students take the bus.

Front

What is the formula for solving proportions?

Back

To solve a proportion, you can use cross-multiplication. If a/b = c/d, then a*d = b*c.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It is often expressed as a quantity per one unit of another quantity.

Front

How do you convert a ratio to a fraction?

Back

To convert a ratio to a fraction, write the first quantity as the numerator and the second quantity as the denominator. For example, the ratio 3:4 can be written as the fraction 3/4.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions state that two ratios are equal.

Front

How do you find the total number of items from a ratio?

Back

To find the total number of items from a ratio, add the parts of the ratio together. For example, in a ratio of 2:3, the total is 2 + 3 = 5 parts.

Front

What is the cost of 1 slice of pizza if a pizza with 8 slices costs $12?

Back

$1.50