7th Grade On Level - 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 two ratios and set the products equal to each other.

Front

If 2 apples cost $20, how much does 1 apple cost?

Back

1 apple costs $10.

Front

If 2 apples cost $20, what will 5 apples cost?

Back

5 apples will cost $50.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

If a car travels 280 miles in 7 hours, what is its speed in miles per hour?

Back

The speed is 40 miles per hour.

Front

If a car travels 40 miles per hour, how far will it travel in 12 hours?

Back

It will travel 480 miles.

Front

Jenny has finished 12 of the 20 lessons in her piano book. What fraction of her lessons has she completed?

Back

She has completed 12/20 or 3/5 of her lessons.

Front

If Liam's piano book has 30 lessons and he has finished a proportional amount compared to Jenny, how many lessons has he finished?

Back

Liam has finished 18 lessons.

Front

What is direct variation?

Back

Direct variation is a relationship between two variables where one variable is a constant multiple of the other.