Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Search
MENU
Learning Math Home
Number and Operation Session 8: Rational Numbers and Proportional Reasoning
 
Session 8 Part A Part B Part C Homework
 
Glossary
Algebra Site Map
Session 8 Materials:
Notes
 

A B C 

Solutions
Video

Notes for Session 8, Part A


Note 2

We're using the term "ratio" here to represent the comparison of one rational number to another in either a part-to-whole or a part-to-part situation, as you will see in Part A. In mathematical notation, a ratio can be written as a/b or a:b. Proportion is a fractional equation comprising two ratios (a/b = c/d). In common language, "proportion" is often used interchangeably with "ratio."

<< back to Part A: Interpreting Fractions, Units, and Unitizing


 

Note 3

The distinction between part-part and part-whole relationships is seldom discussed. Usually we refer to part-part relationships as ratios rather than fractions. The ratio representation is a better way to write the relation, because you won't be tempted to use the rules of fractions to work with them (for example, a ratio of 3 parts to 0 parts cannot be written as a fraction). However, the part-part relationship is sometimes written in fraction form (as it is in this section), even though it represents a ratio. So be sure to understand the difference.

<< back to Part A: Interpreting Fractions, Units, and Unitizing

 

Learning Math Home | Number Home | Glossary | Map | ©

Session 8 | Notes | Solutions | Video

Home | Catalog | About Us | Search | Contact Us | Site Map

  • Follow The Annenberg Learner on Facebook

© Annenberg Foundation 2013. All rights reserved. Privacy Policy