Let’s Practice!
Can you use the area to find the cost?
Goal:
Goal:
You Can Do It!
Goal: Calculate the cost of something by finding the area.
Remember, when you want to find the total cost of something, you must first find the area and then multiply that by the cost per unit or square unit.
A large rectangular area. The outside of the rectangle length is divided into 10 units. The width is divided into 6 units. 10 units \({\times}\) 6 units \({=}\) 60 square units \({\times }\) $5 \({=}\) $300
For each problem below, find the total cost of the area. Then click on the sentence to check your work.
A basketball court has a design in the center that has a length of 10 feet and a width of 7 feet. If you wanted to paint the area at a cost of $8 per square foot, how much would it cost?
10 ft \({\times}\) 7 ft \({=}\) 70 ft\({^2}\). 70 ft\({^2}\) \({\times}\) $8 per square foot \({=}\) \({7 \times 8 = 56}\). Add the zero from 70 ft\({^2}\) to get $560.
Kevin is buying outdoor carpet for his deck, which is 10 feet by 9 feet. If the carpet is $10 per square foot, what is total cost of the carpet that Kevin needs?
10 feet \({\times}\) 9 feet \({=}\) 90 ft\({^2}\). 90 ft\({^2}\) \({\times}\) $10 per square foot \({=}\) $900.
Sam is creating a quilt and needs to buy fabric. The quilt will be 4 feet by 5 feet, and the fabric is $2 per square foot. How much is the total cost of the fabric?
4 feet \({\times}\) 5 feet \({=}\) 20 ft\({^2}\). 20 ft\({^2}\) \({\times}\) $2 \({=}\) $40.
You know your multiplication facts, the distributive property, and how to solve for area. Use what you know to solve each problem below.
What is the total cost?
- $28
- $112
- $80
- $32
Remember, first find the area, width times length, and then multiply by the unit cost.
Correct! You found the area by multiplying width times length and then multiplied the product by the cost.
Remember, first find the area, width times length, and then multiply by the unit cost.
Remember, first find the area, width times length, and then multiply by the unit cost.
What is the total cost?
- $225
- $150
- $400
- $200
Remember, first find the area, which is width times length, and then multiply by the unit cost.
Remember, first find the area, which is width times length, and then multiply by the unit cost.
Remember, first find the area, which is width times length, and then multiply by the unit cost.
Correct! You found the area and then multiplied it by the cost.
Which multiplication sentences match the image?
- \({(4 \times 3) = 12}\) ; \({12 \times $10 = $120}\)
- \({(4 \times 3) + (12 \times $10) = $132}\)
- \({4 \times $10 = $30}\)
- \({(4 + 3) = 7}\) ; \({7 \times $10 = $70}\)
Correct! You found the area and then multiplied it by the cost.
Remember, first find the area, width times length, and then multiply by the unit cost.
Remember, first find the area, width times length, and then multiply by the unit cost.
Remember, first find the area, width times length, and then multiply by the unit cost.
Summary
Questions answered correctly:
Questions answered incorrectly: