Read the rules of a graph first: work out what one space or one picture stands for, then read the values.
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Data and Graphs: Keys and Units
Methods in this video
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- 1
No numbers: use what you know to find one space
When to use it: A scale or picture key is missing. The words, a capacity, the same object in another graph, or a set of number-line values gives enough information to find it.
- Match a known amount to the graph and divide to find one unit. Check the zero point and count partial pictures.
- The same object has the same value on two displays. Their spaces may have different values, so find the second scale again.
- Check your unit against the other facts. On a blank number line, use all the clues instead of guessing the endpoints.
Practise exam-style questions with these methods
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