Keystones — Lintel
Five GCSE retrieval questions · 24 September 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: 3x + 5y = 16 and x + y = 4
Answer: x = 2, y = 2 -
3. Geometry Pythagoras — short side
Find b if a = 13cm and c = 18cm
Answer: 12.45cm -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Expected frequency
A fair coin is flipped 90 times. How many heads would you expect?
Answer: 45