Solving Proportions

Front

What is a proportion?

Back

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

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the variable.

Front

What does it mean to cross-multiply?

Back

Cross-multiplying involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 3/4 = x/16, what is x?

Back

x = 12.

Front

What is the scale in a scale drawing?

Back

The scale is the ratio of a distance on the drawing to the actual distance.

Front

If a drawing has a scale of 1 cm:5 m, how many meters does 10 cm represent?

Back

10 cm represents 50 m.

Front

How do you find the actual distance using a scale?

Back

Multiply the measurement on the drawing by the scale factor.

Front

If a car travels 150 miles in 5 hours, what is its speed?

Back

Speed = Distance/Time = 30 miles per hour.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together.

Front

If 4 pages take 18 minutes to read, how long does 1 page take?

Back

1 page takes 4.5 minutes.