Math 7 Proportions (Flashcard)

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division, showing how many times one value contains or is contained within the other.

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 isolate the variable.

Front

If there are 4 milk chocolates for every 2 dark chocolates, what is the ratio of milk to dark chocolates?

Back

The ratio of milk to dark chocolates is 4:2, which simplifies to 2:1.

Front

If a box contains 34 dark chocolates, how many milk chocolates are there if the ratio is 2:1?

Back

There are 68 milk chocolates in the box.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per one unit.

Front

If Mr. Dulin runs 5 miles in 42 minutes, what is his speed in miles per minute?

Back

His speed is approximately 0.119 miles per minute.

Front

How long will it take Mr. Dulin to run 25 miles at his current speed?

Back

It will take him about 210 minutes to complete the race.

Front

What does it mean for ratios to form a proportion?

Back

It means that the two ratios are equivalent, or that their cross products are equal.

Front

If Mike takes 18 minutes to read 4 pages, how long will it take him to read 30 pages?

Back

It will take him 135 minutes to read 30 pages.