Math 7 Proportions (Flashcard)

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios form a proportion?

Back

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

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.

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.

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.

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.

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.

Front

What is the relationship between ratios and fractions?

Back

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