proportion word problems

Front

What is a proportion?

Back

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

Tags

CCSS.7.RP.A.2A

Front

How do you set up a proportion for a word problem?

Back

Identify the two ratios involved in the problem and set them equal to each other.

Tags

CCSS.7.RP.A.2C

Front

What is the cross-multiplication method?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one ratio by the denominator of the other ratio.

Tags

CCSS.7.RP.A.3

Front

If a model is 3 inches wide and the actual object is 4 feet wide, how do you find the height of the model?

Back

Set up a proportion using the widths and solve for the height.

Tags

CCSS.7.RP.A.2C

Front

What is the scale factor?

Back

The scale factor is the ratio of the dimensions of the model to the dimensions of the actual object.

Tags

CCSS.7.G.A.1

Front

How do you convert feet to inches?

Back

Multiply the number of feet by 12, since there are 12 inches in a foot.

Tags

CCSS.4.MD.A.1

Front

If 30 out of 50 students like pizza, how do you find the expected number of students who like pizza out of 190?

Back

Set up a proportion: 30/50 = x/190 and solve for x.

Tags

CCSS.7.RP.A.3

Front

What is the formula for finding the length of a scale model?

Back

Length of model = (Actual length) * (Scale factor).

Tags

CCSS.7.RP.A.2C

Front

How do you find the missing value in a proportion?

Back

Cross-multiply and then solve for the missing variable.

Tags

CCSS.7.RP.A.2B

Front

What is a scale drawing?

Back

A scale drawing is a representation of an object with accurate proportions reduced or enlarged by a certain factor.

Tags

CCSS.7.G.A.1