Keystones — Lintel
Five GCSE retrieval questions · 19 June 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Write 90 as a product of its prime factors
Answer: 2 × 3² × 5 -
2. Algebra Linear simultaneous equations
Solve: 3x + 5y = 26 and 2x + y = 8
Answer: x = 2, y = 4 -
3. Geometry Pythagoras — short side
Find b if a = 7cm and c = 19cm
Answer: 17.66cm -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Expected frequency
A fair coin is flipped 174 times. How many heads would you expect?
Answer: 87