Study guide: Interpret Scaled Data and Shape Categories
Read scaled picture graphs, fraction-marked line plots, quadrilateral categories, and area partitions.
Ideas to explain in your own words
- A picture graph key may assign several items to each symbol.
- A line plot can record lengths between whole units.
- A quadrilateral has four straight sides.
- A unit fraction names one equal share of a whole.
Useful vocabulary
- scale key
- A statement connecting a symbol or interval to a quantity.
- quadrilateral
- A closed polygon with four straight sides.
Watch your reasoning
- Symbols and recorded items are different units when the key exceeds one.
- Frequency marks count observations rather than adding their measured lengths.
- A shape may belong to both a broad category and one or more narrower categories.
- The denominator is the share count, not the number of tiles in one share.
A worked review example
The key says one square stands for four votes. Six squares record 6×4=24 votes. Counting six symbols correctly is only the first step. The row does not record six votes because each symbol represents a group of four. Write the key next to the row before multiplying. Symbols and recorded items are different units when the key exceeds one. Replace each symbol mentally with a group containing its key amount.
Make a practice plan
- Use a Picture Graph Key Greater Than One: Key five votes per symbol with eight symbols: expected 40 votes.
- Read Measurements on a Fraction-Marked Line Plot: Plot 1/4,1/2,1/2,3/4. Expected: one, two, and one marks at those locations.
- Recognize a Shared Quadrilateral Category: Explain why a nonsquare rectangle is still a quadrilateral. Expected: it has four sides.
- Express Equal Area Parts as Unit Fractions: Twenty-four tiles in eight equal three-tile shares: expected one share is 1/8.