Keystones — Lintel
Five GCSE retrieval questions · 28 April 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Express 200 as a product of prime factors
Answer: 2³ × 5² -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 30 and 3x - y = 12
Answer: x = 6, y = 6 -
3. Geometry Pythagoras — short side
Find b if a = 15cm and c = 25cm
Answer: 20cm -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:2. Find a:b:c.
Answer: 3:4:8 -
5. Statistics Expected frequency
A fair coin is flipped 120 times. How many heads would you expect?
Answer: 60