Grade 5

You might draw a table on the board with these four row headings (in order): Number of Inches, × 2, ÷ 4, and Number of Inches.

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.

- 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).

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