Keystones — Cornerstone
Five GCSE retrieval questions · 13 August 2026 · mathsvault.uk/keystones
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1. Number Index law — multiplication
Simplify: 92 × 93
Answer: 95 -
2. Algebra Unknowns on both sides
Solve: 6x - 9 = 4x + 11
Answer: x = 10 -
3. Geometry Converting mixed metric units
Convert 8 litres to ml
Answer: 8000ml -
4. Ratio Mixed ratio problems
Simplify the ratio 20:10
Answer: 2:1 -
5. Statistics Expected frequency
A fair coin is flipped 74 times. How many heads would you expect?
Answer: 37