Numerical Reasoning & Data Interpretation
DataLesson 1 of 3
Bar Charts, Line Graphs & Visual Analytics
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Data interpretation questions test rapid extraction of numerical insights from graphics.
Percentage Change: \Delta \%=\frac{\text{New}−\text{Old}}{\text{Old}} \times 100
- Check axis scales carefully (e.g. millions vs thousands, log vs linear).
- Dual-axis graphs: Match line/bar series to the correct left or right vertical axis.
- Benchmark estimation: Round numbers to 2 significant digits for quick mental math.
- Verify units and multiplier scales on both axes.
- Round values to simplify division or multiplication.
- Compare visual slopes to detect maximum growth periods.
Exam strategy
Focus on understanding underlying concepts — exam questions test application, not memorization.
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