Keystones — Lintel
Five GCSE retrieval questions · 15 June 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Express 120 as a product of prime factors
Answer: 2³ × 3 × 5 -
2. Algebra Linear simultaneous equations
Solve: 2x + 2y = 18 and x + 3y = 15
Answer: x = 6, y = 3 -
3. Geometry Pythagoras — short side
Calculate the missing side: a = 19cm, c = 25cm
Answer: 16.2cm -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 5:4. Find a:b:c.
Answer: 2:5:4 -
5. Statistics Expected frequency
A fair coin is flipped 54 times. How many heads would you expect?
Answer: 27