Ratios Test Prep

Circumference

100

Find the circumference of a circle that has a diameter of 10.

C = 31.4

200

Find the circumference of a circle that has a diameter of 8.

C = 25.12

300

Find the circumference of a circle that has a radius of 5.

C = 31.4

400

FInd the circumference of a circle that has a radius of 6.

C = 37.68

500

Find the circumference of a circle that has radius of 3.25.

C = 20.41

Area

100

Find the area of a circle that has a radius of 10.

A = 314

200

Find the area of a circle that has a radius of 5.

A = 78.5

300

Find the area of a circle that has a diameter of 20.

A = 314

400

Find the area of a circle that has a radius of 9.

A = 254.34

500

Find the area of a circle that has a radius of 2.5.

A = 19.625

Scale Factor

100

What is the scale factor for the ratio 2:4?

2

200

What is the scale factor of the ratio 6 to 60?

10

300

What is the scale factor of 6:2?

1/3

400

What is the scale factor of 144 to 12?

1/12

500

What is the scale factor of 88/11?

1/8

Scale

100

I am using a microscope to view a leaf cell. The scale is 1mm:10inches. If the cell is 2mm how big is the cell in the microscope? Don't forget your units!

20 inches

200

I am building a dollhouse replica of my house. The house to dollhouse scale is 15 feet to 3 inches. If my house is 90 ft wide, how wide will my dollhouse be? Don't forget your units!

18 inches

300

I am using 1/2 inch pieces of wood to construct a picture frame. If I need 12 pieces of wood to construct 3 picture frames, how many would I need to build 8? 

32

400

I am wanting to print a poster for my parents from a 4in x 6in picture. The picture to poster scale factor is 3. What are the final measurements of the poster? 

12in x 18in

500

When I blow a bubble with bubble gum the sphere expands by a scale factor of 1.5. If my bubble is 32.5mm wide and 24mm tall to start, how big does it expand?

48.75mm x 36mm

Scale Drawings

100

I am reorganizing my bedroom so I decided to make a scaled blueprint on a piece of paper. The blueprint scale is 1in:5ft. If my room is 25 feet wide, how wide will the room be on the blueprint?

5 inches

200

Ms. Kreun has an assignment to make a scale drawing of an bug. She wants us to use the scale of 1cm:5in for real life to drawing. If I my piece of paper is 30in long, what is the longest my bug can be? Don't forget your units!

6cm

300

The scale for a blueprint of a microchip is 1in:0.25cm. If the microchip is 3.5cm wide, how wide is the blueprint? Don't forget your units!

14in

400

I want to start my own business creating miniatures to sell. In the Super Mario movie, Mario is about 3ft tall by 1.5ft. If my miniature scale is 2cm:0.75ft what will the dimensions of my mini Mario be?

4cm x 8cm

500

I'm crafting a hot air balloon to replicate my cat. My cat is 7.25in long and 2.75in wide, the scale for the hot air balloon is 24ft:0.25in. What are the dimensions of the hot air balloon?

696ft x 264ft