body{margin:0;} noscript{z-index: 10000; position: fixed; display: block; height: 100%; width: 100%; background: #fff;} noscript .fa{font-size: 40px; display:block; color: #daa520;} noscript div{margin-top: 6%; padding-left: 20px; padding-right: 20px; text-align: center;} ! You must have JavaScript enabled to use this site.

Dashboard

Big Ideas Math: Modeling Real Life, Grade 7 View details

1. Ratios and Ratio Tables

Continue to next subchapter

Exercise 3 Page 185

Use the portion where both values are known.

Gallons	0.4	1.2	1.6
Days	0.75	2.25	3

Equivalent Ratios: 0.4:0.75, 1.2:2.25, and 1.6:3

Practice makes perfect

We want to complete a table. We can use the portion where both values are known to find the missing values.

Gallons	0.4	1.2	1.6
Days	0.75

We know that we use 0.4 gallons in 0.75 days. Let's write this as a ratio. 0.4gallons/0.75days or 0.4/0.75

We will use this rate to find the missing values.

First Value

We can find an equivalent ratio with a numerator of 1.2 to find in how many days we use 1.2 gallons.

0.4/0.75

ExpandFrac

a/b=a * 3/b * 3

0.4* 3/0.75* 3

Multiply

1.2/2.25

We use 1.2 gallons in 2.25 days.

Gallons	0.4	1.2	1.6
Days	0.75	2.25

Second Value

Now, we can find an equivalent ratio with a numerator of 1.6 to find in how many days we use 1.6 gallons.

0.4/0.75

ExpandFrac

a/b=a * 4/b * 4

0.4* 4/0.75* 4

Multiply

1.6/3

We use 1.6 gallons in 3 days.

Gallons	0.4	1.2	1.6
Days	0.75	2.25	3

The equivalent ratios are 0.4:0.75, 1.2:2.25, and 1.6:3.

Subchapter links

Try It p.184-185

Self-Assessment for Concept & Skills p.185

Self-Assessment for Problem Solving p.186

Review & Refresh p.187

Concept, Skills, & Problem Solving p.187-188

Exercise 3 Page 185

Hints

Check the answer

Practice exercises

Asses your skill

First Value

Second Value