What does the fraction [ggfrac]3/5[/ggfrac] mean to you? Show with a picture.

A whole is split into 5 equal parts, and 3 of the parts are shaded.

How many parts are shaded? How many parts are not shaded?

3 parts are shaded, and 2 parts are not shaded.

Give an example of a part-to-whole ratio in words and in symbols.

Orange juice is 2 parts fruit concentrate out of 5 parts total. [ggfrac]2/5[/ggfrac] of the juice is fruit concentrate.

Give an example of a part-to-part ratio in words and in symbols.

There are 3 pink carnations for every 2 red roses. 3 : 2

Let’s say there are 8 teachers in a group of 40 teachers and students. Without simplifying or making the numbers bigger, what ratios describe this situation?

[ggfrac]8/40[/ggfrac] are teachers. 8 teachers : 32 students. 32 students : 8 teachers. [ggfrac]32/40[/ggfrac] are students.

Without doubling or halving, name some ratios that are equivalent to 100 : 200.

10 : 20. 25 : 50. 300 : 600. 1,000 : 2,000. (The goal is to get past multiplying and dividing by 2.)

How can you display ratios from a table on a graph?

Use one row of data for the x-coordinates and the other row for the y-coordinates. Place a point for each ratio and draw a line between the points.

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Intro to Ratios

LESSON MATERIALS move

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Intro to Ratios

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What you will learn from this videoWhat you will learn

That a ratio describes the relationship between two quantities.
How to make equivalent ratios and show them on a graph.
That this knowledge can help us learn about pets, volunteer at an animal shelter, and find great deals when shopping.

Discussion Questions
- Before Video
  When you hear the phrase “10% fruit,” what part of the juice is fruit and what part is water?ANSWER
  - 10% is fruit and 90% is water.
  In a group of 20 animals, there are 5 cats and the rest are dogs. How many dogs are in the group?ANSWER
  - 15.
  That group of cats and dogs is joined by another identical group of animals. How many cats are there now? How many dogs are there now?
  ANSWER
  - There are 10 cats and 30 dogs.
  What does the fraction [ggfrac]3/5[/ggfrac] mean to you? Show with a picture.ANSWER
  - A whole is split into 5 equal parts, and 3 of the parts are shaded.
  How many parts are shaded? How many parts are not shaded?ANSWER
  - 3 parts are shaded, and 2 parts are not shaded.
- After Video
  Give an example of a part-to-whole ratio in words and in symbols.ANSWER
  - Orange juice is 2 parts fruit concentrate out of 5 parts total. [ggfrac]2/5[/ggfrac] of the juice is fruit concentrate.
  Give an example of a part-to-part ratio in words and in symbols.ANSWER
  - There are 3 pink carnations for every 2 red roses. 3 : 2
  Let’s say there are 8 teachers in a group of 40 teachers and students. Without simplifying or making the numbers bigger, what ratios describe this situation?ANSWER
  - [ggfrac]8/40[/ggfrac] are teachers. 8 teachers : 32 students. 32 students : 8 teachers. [ggfrac]32/40[/ggfrac] are students.
  Without doubling or halving, name some ratios that are equivalent to 100 : 200.ANSWER
  - 10 : 20. 25 : 50. 300 : 600. 1,000 : 2,000. (The goal is to get past multiplying and dividing by 2.)
  How can you display ratios from a table on a graph?ANSWER
  - Use one row of data for the x-coordinates and the other row for the y-coordinates. Place a point for each ratio and draw a line between the points.
Vocabulary
- Ratio DEFINE
- Colon DEFINE
- Fraction DEFINE
- Equivalent fractions DEFINE
- Part-to-part ratio DEFINE
- Part-to-whole ratio DEFINE
- Simplify DEFINE
- Coordinate Grid DEFINE

Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket

Intro to Ratios

Discussion Questions

Vocabulary

Reading Material

Practice Word Problems

Practice Number Problems

Lesson Plan

Teacher Guide

Assessment