Graph
Draw double line graphs
Plot two related series from one table on the same labeled grid. Use the legend to keep their points and lines distinguishable.
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Read double line graphs
Compare two series on a shared graph and answer five questions about values, changes, totals and differences.
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Identify the series and category named in the question before reading the height. For a combined total, include exactly the series and categories requested.
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Customize this worksheetRead the scale before starting
Read the axis or symbol key before answering. Hard drawing tasks state a conversion between table and axis units. A stack of X marks or pictures is a quantity only after applying its printed key.
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Learning objective
What this activity builds
Use series labels and a shared scale to make valid comparisons and calculations.
Worked example
At one category, series A is 14 and B is 9. What is their combined total?
23.
Read both series at the same category, then add 14 + 9. Using B from another category would answer a different question.
Teaching notes
Make the practice count
- Easy practice includes values from both series, direction, comparison and minima for both.
- Hard practice includes combined totals, absolute differences, category sets and a subtotal across two categories and both series.
- When asked where A exceeds B, inspect every category and include every valid answer. A tie is not an exceedance.
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A useful next step
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