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### Course: 6th grade (Illustrative Mathematics)>Unit 2

Lesson 1: Lesson 1: Introducing ratios and ratio language

# Ratio review

Learn how to find the ratio between two things given a diagram.
A ratio compares two different quantities.
For example, those two quantities could be monkeys and bananas:
Notice that there are $4$ monkeys and $5$ bananas.
Here are a few different ways we can describe the ratio of monkeys to bananas:
1. There are $4$ monkeys for every $5$ bananas.
2. The ratio of monkeys to bananas is $4$ to $5$.
3. The ratio of monkeys to bananas is $4:5$.
Order matters in ratios. Here are a few different ways to describe the ratio of bananas to monkeys:
1. There are $5$ bananas for every $4$ monkeys .
2. The ratio of bananas to monkeys is $5$ to $4$.
3. The ratio of bananas to monkeys is $5:4$.

## Let's practice!

Problem 1
Dana loves rocks! She has $6$ pieces of granite, $3$ pieces of marble, $14$ pieces of sandstone, and $1$ piece of slate.
What is the ratio of pieces of sandstone to pieces of marble in Dana's collection?