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 find a missing value in a ratio table?

Back

To find a missing value in a ratio table, set up a proportion using the known values and solve for the unknown.

Front

If the scale is 1cm = 8km, how do you convert centimeters to kilometers?

Back

Multiply the number of centimeters by 8 to convert to kilometers.

Front

What is the formula to calculate the time taken based on distance and speed?

Back

Time = Distance ÷ Speed.

Front

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

Back

Speed = 5 miles ÷ 42 minutes = 0.119 miles per minute.

Front

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

Back

It means that the two ratios are not equivalent.

Front

How do you solve for x in a proportion?

Back

Cross-multiply the ratios and then isolate x.

Front

If iTunes sells 9 songs for $8.85, what is the cost per song?

Back

Cost per song = $8.85 ÷ 9 songs = $0.983 per song.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

How can you check if two ratios form a proportion?

Back

Cross-multiply the ratios and see if the products are equal.