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Here is an illustrative task for KS3 map practice or GCSE geographical skills: on a correctly scaled 1:25,000 paper map, two points are 4 cm apart in a straight line. How far apart are they on the ground?

A learner might multiply 4 by 25,000 and write “100,000 metres”. The multiplication is right, but the units have changed too soon. The scale compares the same unit on the map and on the ground:

• 4 × 25,000 = 100,000 cm on the ground.
• Divide by 100 to get 1,000 metres.
• Divide by 1,000 to get 1 kilometre.

A clearer answer is: “The straight-line distance is 1 km.” If the question asks for distance along a winding path, follow the path’s bends when measuring; joining the endpoints answers a different question.

There is an extra check in an online lesson. Zooming a map image can change its physical size on screen, so a ruler held against the screen may no longer match the printed ratio. Use a scale bar that stays with the map and resizes in the same proportions, or use a correctly scaled printout.

For a follow-up, try 6 cm at the same scale: 1.5 km. Explain the conversion aloud and state which distance you measured. That checks whether the method transfers to a new question.

Consider this invented pedestrian-count exercise, using equal ten-minute counts at three sites:

“There are fewer people farther away” identifies the pattern but leaves out its size. A more precise description is: “Counts fall from 120 people at the station to 40 at 400 m away, a decrease of 80 people per ten-minute count.”

Now separate description from explanation. “The station caused the difference” goes further than these figures support. Other shops or destinations, the time of day and the sampling method could matter. A better conclusion is: “These samples show lower counts at sites farther from the station, but they do not establish why.”

AQA’s GCSE fieldwork guidance distinguishes describing data, adding numerical precision and explaining findings. In an online practice lesson, put the table beside your answer and identify which figures support each sentence. For further practice, suggest one way to investigate the uncertainty: repeat equal-duration counts at the same sites at other times, then compare the patterns. Explain that this would test whether the first pattern persists; it would not, by itself, prove the cause.

At A-level, develop this habit by weighing how the method, alternative explanations and the limits of the sample affect the strength of your conclusion.