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Big Ideas Math: Modeling Real Life, Grade 6

BI

Big Ideas Math: Modeling Real Life, Grade 6 View details

1. Ratios

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Exercise 7 Page 110

How many sharks are there? How many dolphins?

See solution.

Practice makes perfect

Recall that a ratio is a comparison of two quantities by division. For example, the ratio of a to b can be written in two different ways. a/b or a: b

The number a b is called the value of the ratio. It describes the multiplicative relationship between the quantities in a: b. We want to write the ratio of sharks to dolphins from the following diagram.

Given diagram

Let's count the sharks and the dolphins.

Given diagram

We have 4 sharks and 5 dolphins. Then, the ratio of sharks to dolphins is 4: 5 and its value is 4 5. This indicates that there are 4 sharks for every 5 dolphins.

Subchapter links

Try It p.108-110

Self-Assessment for Concepts & Skills p.110

Self-Assessment for Problem Solving p.111

Review & Refresh p.112

Concepts, Skills, & Problem Solving p.112-114