Graph
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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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 each series in the table, plot its values and connect its neighboring points. Follow the different marker or line styles in the legend.
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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
Represent two sequences on a common scale while preserving each series identity.
Worked example
Series A has 3 and series B has 5 at the same category. Where should their points go?
Both use that category position, at heights 3 and 5 respectively.
The two series share an axis and category spacing. Their distinct symbols identify which value belongs to each series.
Teaching notes
Make the practice count
- Plot and check one series before beginning the other.
- Easy has five categories with matching units. Hard has seven categories and an explicit table-to-axis conversion.
- Use the legend even in grayscale. A line crossing does not mean the series have exchanged names.
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A useful next step
Related activities
Graph
Draw single line graphs
Turn a data table into a line graph. Easy practice has five categories; hard practice has seven and an explicit conversion between table and axis units.
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Graph
Read single line graphs
Answer five questions from a completed line graph, from reading values and changes to combining quantities and explaining comparisons.
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