Keystones — Lintel
Five GCSE retrieval questions · 3 August 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Write 72 as a product of its prime factors
Answer: 2³ × 3² -
2. Algebra Linear simultaneous equations
Solve: 2x + 3y = 37 and 3x - y = 17
Answer: x = 8, y = 7 -
3. Geometry Pythagoras — short side
Find b if a = 12cm and c = 17cm
Answer: 12.04cm -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Expected frequency
A fair coin is flipped 60 times. How many heads would you expect?
Answer: 30