Keystones — Lintel
Five GCSE retrieval questions · 9 August 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: 5x + 3y = 44 and x + 3y = 28
Answer: x = 4, y = 8 -
3. Geometry Pythagoras — short side
Find b if a = 14cm and c = 23cm
Answer: 18.25cm -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Expected frequency
A fair coin is flipped 70 times. How many heads would you expect?
Answer: 35