Keystones — Lintel
Five GCSE retrieval questions · 3 May 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Write 36 as a product of its prime factors
Answer: 2² × 3² -
2. Algebra Linear simultaneous equations
Solve: 4x + 3y = 36 and x + 2y = 14
Answer: x = 6, y = 4 -
3. Geometry Pythagoras — short side
Calculate the missing side: a = 18cm, c = 38cm
Answer: 33.5cm -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 4:2:4 -
5. Statistics Expected frequency
A fair coin is flipped 172 times. How many heads would you expect?
Answer: 86