Reading · Integration of knowledge & ideas
Interpreting Charts, Maps & Visual Evidence
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Start here: your learning goal
Read charts, maps, legends, and scales; check what a visual actually supports.
Read the explanations, try the quick checks, then take the lesson quiz to see what to review next.
Read a visual as evidence, not decoration. This lesson covers charts, maps, diagrams and the relationship between an image and a written claim. The arithmetic stays simple; the main task is deciding what the representation supports.
Read the frame before the values
First identify the title, population, time period, units, labels and legend. A bar chart compares categories; a line graph shows an ordered change, usually across time; a table supports exact lookup. A map adds location, direction and a key. A process diagram uses arrows to show a relationship or sequence, not necessarily physical distance.
Then name the comparison the question requests. “Most trips” asks for a count; “highest participation rate” asks for a proportion. A larger group may have more participants but a lower rate. Check whether a symbol stands for one item or several, and whether the display omits categories.
Worked example: counts are not rates
The invented library report below counts completed reading logs. The groups had different enrollment totals.
| Group | Completed logs | Enrolled |
|---|---|---|
| Oak | 18 | 30 |
| Pine | 24 | 60 |
| Elm | 15 | 25 |
Pine has the most completed logs, 24. Oak and Elm tie for the highest completion rate, 60%; Pine's rate is 40%. “Pine performed best” is too vague until “best” is defined. A chart of completed logs alone cannot establish the highest rate.
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