Proportions - Scaling Up and Scaling Down

Front

What is a proportion?

Back

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

Front

How do you scale up a quantity?

Back

To scale up a quantity, you multiply it by a factor greater than 1.

Front

How do you scale down a quantity?

Back

To scale down a quantity, you multiply it by a factor less than 1.

Front

If 40 apples fit into 3 baskets, how many apples fit into 12 baskets?

Back

160 apples

Front

If Jesse makes $39,000 per year, how much does he make in 3 years?

Back

$117,000

Front

What is the ratio of teachers to students if there are 2 teachers for every 26 students?

Back

The ratio is 1 teacher for every 13 students.

Front

If a hummingbird's wings beat 280 times in 4 seconds, how many seconds for 70 beats?

Back

1 second

Front

If 9 truckloads can ship 1200 boxes, how many boxes can 3 truckloads ship?

Back

400 boxes

Front

What is the formula to find a missing value in a proportion?

Back

Cross-multiply the ratios and solve for the missing value.

Front

What does it mean to find a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity per 1 unit.