Data interpretation mastery: tables, graphs, and charts
Data interpretation is the single most common question type in numerical reasoning tests. You are given a table, bar chart, line graph, or pie chart and asked to calculate, compare, or extrapolate. The data is always sufficient — the challenge is finding it fast.
The reading order that saves time
- Read the question first. Know what you need before looking at the data.
- Read titles, axis labels, and units. Is it thousands or millions? Quarterly or annual?
- Locate the relevant data points. Ignore everything else.
- Calculate and sanity-check. Does the answer feel right given the scale?
Regional revenue ($ millions)
Total = 42 + 38 + 56 + 14 = 150. APAC share = 42 / 150 = 28%.
Trap: candidates often calculate 42 / 56 (comparing to the largest region) instead of 42 / 150 (share of total).
Table questions
Tables are the densest format. They pack a lot of data into a small space, which means the main risk is reading the wrong row or column. Use your finger (or cursor) to track across rows.
Growth = (4.0 − 3.2) / 3.2 = 0.8 / 3.2 = 25%.
Common error: dividing by the new value (0.8 / 4.0 = 20%). Always divide by the base (starting) value.
Chart-specific traps
- Bar charts: stacked vs grouped. Stacked bars require subtraction to get individual values.
- Line graphs: the y-axis may not start at zero, exaggerating trends.
- Pie charts: you often need to compute the underlying value from a percentage and a given total.
Drill data interpretation on forge
323 data interpretation questions across SHL, AON, Cappfinity, and Forge — each tagged to a specific sub-skill.
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