Headline Story
Equivalence and Comparison of Fractions, #3
Click to enlarge
Introduction
You might draw a table on the board with these four row headings (in order): Number of Inches, × 2, ÷ 4, and Number of Inches.
Headline Story
Joe takes a certain number of inches, doubles it, and then divides the result by 4. Jane says she has a quicker way to do it. What might Jane’s quicker way be? Give examples with numbers.
Possible student responses
- If you started with 6 inches, you would end up with 3.
- If you started with 20 inches, you’d end up with 10.
- Doubling and then dividing by four is the same as just dividing by 2 (or figuring out one half of the number you started with).
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.