Writing and Solving Proportions

Front

What is a proportion?

Back

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

Front

How do you write a proportion?

Back

A proportion can be written as a/b = c/d, where a, b, c, and d are numbers.

Front

What is the cross-multiplication method in solving proportions?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio to find the unknown.

Front

If 5 ice cream cones are sold for every 3 brownies, what is the ratio of ice cream cones to brownies?

Back

The ratio is 5:3.

Front

How do you find the total number of items sold using proportions?

Back

Set up a proportion based on the known ratio and solve for the unknown quantity.

Front

If Nathan packs 39 boxes in 3 hours, how many boxes does he pack per hour?

Back

He packs 13 boxes per hour.

Front

What is the formula to find the total number of boxes packed in a given time?

Back

Total boxes = boxes per hour × total hours.

Front

If 13 candy bars weigh 26 ounces, what is the weight of one candy bar?

Back

Each candy bar weighs 2 ounces.

Front

How do you find the weight of multiple items using proportions?

Back

Multiply the weight of one item by the total number of items.

Front

If a photographer takes 12 pictures in 5 minutes, how many pictures does he take per minute?

Back

He takes 2.4 pictures per minute.