Keystones — Lintel
Five GCSE retrieval questions · 5 August 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Express 100 as a product of prime factors
Answer: 2² × 5² -
2. Algebra Linear simultaneous equations
Solve: 5x + 2y = 14 and x + 3y = 8
Answer: x = 2, y = 2 -
3. Geometry Pythagoras — short side
Calculate the missing side: a = 14cm, c = 29cm
Answer: 25.4cm -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 5:7. Find a:b:c.
Answer: 3:5:7 -
5. Statistics Expected frequency
A fair coin is flipped 82 times. How many heads would you expect?
Answer: 41