Unit 4 Review

Front

What is a ratio?

Back

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

Front

How do you calculate the cost of one item if you know the total cost and quantity?

Back

Divide the total cost by the number of items. For example, if 5 books cost $7, then one book costs $7 ÷ 5 = $1.40.

Front

What is the formula to convert hours into minutes?

Back

Multiply the number of hours by 60. For example, 4 hours = 4 × 60 = 240 minutes.

Front

If the ratio of red apples to green apples is 4:3, how many red apples are there if there are 12 green apples?

Back

To find the number of red apples, set up a proportion: 4/3 = x/12. Solving gives x = 16 red apples.

Front

What is the total cost for 20 bags of popcorn if 5 bags cost $15?

Back

If 5 bags cost $15, then 1 bag costs $15 ÷ 5 = $3. Therefore, 20 bags cost 20 × $3 = $60.

Front

What does it mean to solve for a variable in an equation?

Back

To solve for a variable means to find the value of that variable that makes the equation true.

Front

What is the relationship between fractions and ratios?

Back

A ratio can be expressed as a fraction, where the first quantity is the numerator and the second quantity is the denominator.

Front

How do you find the total cost of multiple items?

Back

Multiply the cost of one item by the number of items. For example, if one book costs $1.40, then 5 books cost 5 × $1.40 = $7.

Front

What is the significance of understanding unit rates?

Back

Unit rates allow you to compare different quantities on a per-unit basis, making it easier to understand costs and values.

Front

How do you convert minutes into hours?

Back

Divide the number of minutes by 60. For example, 120 minutes = 120 ÷ 60 = 2 hours.