Cross multiplication

Front

What is cross multiplication?

Back

A method used to solve equations involving fractions by multiplying the numerator of one fraction by the denominator of the other.

Tags

CCSS.7.EE.B.3

Front

When can you use cross multiplication?

Back

Cross multiplication can be used when you have an equation in the form of a/b = c/d, where a, b, c, and d are numbers.

Front

What is the first step in cross multiplication?

Back

Identify the two fractions that you want to compare or solve.

Tags

CCSS.4.NF.A.2

Front

If a/b = c/d, what does cross multiplication yield?

Back

ad = bc, where a and b are from the first fraction and c and d are from the second.

Tags

CCSS.5.NF.B.5B

Front

Solve for x: 2/x = 4/8

Back

x = 4.

Tags

CCSS.7.RP.A.3

Front

What is the relationship between fractions and ratios?

Back

Fractions can be expressed as ratios, where the numerator is the first term and the denominator is the second term.

Front

How do you check your answer after using cross multiplication?

Back

Substitute the value back into the original equation to see if both sides are equal.

Tags

CCSS.6.EE.B.7

Front

Solve for y: 3/y = 6/9

Back

y = 4.5.

Tags

CCSS.6.EE.B.7

Front

What happens if you cross multiply incorrectly?

Back

You may arrive at an incorrect solution, leading to misunderstandings in the problem.

Tags

CCSS.6.EE.B.7

Front

Can cross multiplication be used for more than two fractions?

Back

No, cross multiplication is specifically for two fractions at a time.

Tags

CCSS.3.NF.A.3D