Math 7 Proportions (Flashcard)

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Tags

CCSS.7.RP.A.2A

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Tags

CCSS.7.RP.A.2A

Front

What is the scale in a map?

Back

The scale is the ratio of a distance on the map to the actual distance it represents.

Tags

CCSS.7.RP.A.2C

Front

If 1 cm on a map represents 8 km in reality, how do you calculate the real distance for 24 cm?

Back

Multiply 24 cm by 8 km/cm to get 192 km.

Tags

CCSS.6.RP.A.3B

Front

What is the formula to find the missing value in a ratio table?

Back

Use cross-multiplication to find the missing value.

Front

If 190 people fit in 3 buses, how do you find the number of buses needed for 570 people?

Back

Set up a proportion: 190/3 = 570/x, then solve for x.

Tags

CCSS.7.RP.A.3

Front

What does it mean if two ratios do not form a proportion?

Back

It means that the cross products of the ratios are not equal.

Tags

CCSS.7.RP.A.2A

Front

How can you solve for x in a proportion?

Back

Cross-multiply and then isolate x.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

Front

What is the relationship between ratios and fractions?

Back

Ratios can be expressed as fractions, showing the same relationship between the two quantities.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2