Scale Ratios

Chris drew a sketch of the Sears Tower. His drawing is 9 inches tall. The tangible Sears Tower is 1,729 feet tall including the spires. What is the scale ratio of the drawing?

• 1,729 feet : 9 inches

• 9 inches : 1,729 feet

• 9:1,000

• 1:4

Answer explanation

It is fine to have different units in a scale ratio, as long as they are identified.

Tags

CCSS.7.G.A.1

Julia built a model of the Great Sphinx of Egypt. The ancient Sphinx monument is 66 feet high. Julia's model is 8 feet high. What is the scale of Julia's model?

Answer explanation

Start with the model measurement, then a colon, then the measurement of the tangible item. You may reduce the ratio if possible. For example, a ratio of 5:25 could be reduced to 1:5.

Tags

CCSS.7.G.A.1

Marcus drew a sketch of the Roman Pantheon. The tangible monument is 143 feet tall. Marcus' drawing is 8 inches high. What is the scale ratio of Marcus' drawing?

• 8 inches : 143 feet

• 8:143

• 143 feet : 8 inches

• 143 inches : 8 feet

Answer explanation

It is fine to have different units in a scale ratio, as long as they are identified. Start with the measurement of the drawing or model, then a colon, then the measurement of the tangible item.

Tags

CCSS.7.G.A.1

John and his design team built an architecture model of a school. The model is 8 inches high. The school will be 32 feet high. What is the scale of the model? Please reduce the ratio.

• 8 feet : 32 inches

• 4:1

• 1 inch : 4 feet

• 8:32

Answer explanation

1:4 is a typical architectural scale, and it can be written without units.

Tags

CCSS.7.RP.A.2C

Jay drew a sketch of an owl. The living owl is 16 inches high. Jay's drawing is 5 inches high. Please write the scale ratio of Jay's drawing.

Answer explanation

Start with the drawing measurement, then a colon, then the measurement of the tangible item.

Tags

CCSS.7.G.A.1

Kira drew a sketch for an architecture model. Her drawing is 7 inches high. The tangible model will be 15 inches high. Please write the scale ratio of Kira's drawing.

Answer explanation

Start with the drawing measurement, then a colon, then the measurement of the tangible item.

Tags

CCSS.7.G.A.1

Mia drew a sketch for a mural that will be painted in her school gym. Her drawing is 2 feet high. The actual mural painting will be 10 feet high. Please write the scale ratio of Mia's drawing. You may reduce the ratio if you wish.

Answer explanation

Start with the drawing measurement, then a colon, then the measurement of the actual item.

Tags

CCSS.7.G.A.1

Andrew sketched his friend. The friend is 5 feet, 9 inches (5'9") tall. Andrew's drawing is 8 inches high. Please write the scale ratio of the drawing. Please convert 5'9" into inches in order to write the ratio.

Answer explanation

To convert feet to inches, multiply the number of feet times 12, because there are 12 inches in one foot.

Tags

CCSS.7.G.A.1

Q1. What is the length of the object?

• 6.2 centimeters

• 6.25 centimeters

• 13 centimeters

• Not here

15 inches

• 1. 15 inches

• 5 inches

• 14.4 inches

• 30 inches

Tags

CCSS.HSG.SRT.B.5