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 terms and then solve for the variable.

Front

If a/b = c/d, what is the cross-multiplication method?

Back

The cross-multiplication method states that a*d = b*c.

Front

What is the first step in solving the proportion 3/x = 6/12?

Back

Cross-multiply to get 3*12 = 6*x.

Front

What is the value of x in the proportion 3/x = 6/12?

Back

x = 8.

Front

If 5/8 = x/32, how do you find x?

Back

Cross-multiply: 5*32 = 8*x, so x = 20.

Front

What is the relationship between ratios and proportions?

Back

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

Front

If Shane can bake 120 dozen cookies in five days, how many days would it take to bake 800 dozen cookies?

Back

It would take 33 days.

Front

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

Back

If a/b = c/x, then x = (b*c)/a.

Front

How can you check if two ratios form a proportion?

Back

You can check by cross-multiplying and seeing if the products are equal.