Reading Charts Quickly
Charts and graphs are central to numerical reasoning tests. You need to read them quickly, identify key values, and answer questions under time pressure. Here's how to improve your chart-reading speed.
Types of Charts You'll See
Bar charts – Compare values across categories. Read the axis labels first. Values are often on the vertical axis; categories on the horizontal.
Line graphs – Show trends over time. The x-axis is usually time (years, quarters, months). The y-axis is the value. Look for peaks, troughs, and overall direction.
Pie charts – Show proportions of a whole. Each slice represents a percentage. To compare, estimate or calculate: slice angle ÷ 360 × 100 ≈ percentage.
Tables – Rows and columns of data. Check row and column headers before reading values. Note units (£000, millions, etc.).
Quick Reading Strategy
- Read the title – What does the chart show?
- Check the axes – What are the units? What do the labels mean?
- Scan for the question – What value do you need? Locate it before calculating.
- Estimate when possible – If answers are far apart, estimation may be enough.
Common Pitfalls
- Misreading axis scales (e.g. 0–100 vs 0–1000)
- Confusing similar-looking bars or lines
- Ignoring "of which" or stacked segments in pie charts
Practice with numerical reasoning questions and the numerical reasoning test.
Frequently Asked Questions
How do I read a stacked bar chart?
Each segment of the bar represents a part of the total. Read the value at the top of each segment, or calculate the segment height if you need a component value.
What if the chart has two y-axes?
Check which axis applies to which data series. Lines or bars are often colour-coded or labelled. Don't mix them up.
How can I practise reading charts faster?
Do timed practice tests with chart-based questions. Focus on identifying the right data point before calculating. Speed improves with repetition.