Unit 2 Lessons 8-9 Unit Rate and Constant Speed

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together. It expresses how much of one quantity corresponds to one unit of another quantity.

Front

How do you calculate the cost per item?

Back

To calculate the cost per item, divide the total cost by the number of items. For example, if 10 apples cost $3.50, the cost per apple is $3.50 ÷ 10 = $0.35.

Front

What is the formula for finding constant speed?

Back

The formula for finding constant speed is: Speed = Distance ÷ Time.

Front

If 5 tea bags are used for 1 gallon of water, how many tea bags are needed for 4 gallons?

Back

20 tea bags are needed for 4 gallons (5 tea bags x 4 gallons = 20 tea bags).

Front

What is the unit rate if you spend $40 on 5 pounds of concrete?

Back

The unit rate is $8 per pound ($40 ÷ 5 pounds = $8 per pound).

Front

How do you fill in a ratio table?

Back

To fill in a ratio table, maintain the same ratio between the quantities. For example, if the ratio is 10:45, for every 10 units of one quantity, there are 45 units of another.

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

Front

How do you find the total cost of multiple items?

Back

To find the total cost of multiple items, multiply the cost of one item by the number of items. For example, if one apple costs $0.35, then 10 apples cost $0.35 x 10 = $3.50.

Front

What does it mean if a speed is constant?

Back

Constant speed means that an object covers equal distances in equal intervals of time, regardless of how small those intervals are.

Front

If a recipe calls for 12 cups of flour for 3 batches, how much flour is needed for 1 batch?

Back

4 cups of flour are needed for 1 batch (12 cups ÷ 3 batches = 4 cups per batch).