Keystones — Lintel
Five GCSE retrieval questions · 16 June 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: 2x + 3y = 37 and 2x + 4y = 44
Answer: x = 8, y = 7 -
3. Geometry Pythagoras — short side
Find b if a = 12cm and c = 21cm
Answer: 17.23cm -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 5:6. Find a:b:c.
Answer: 4:5:6 -
5. Statistics Expected frequency
A fair coin is flipped 132 times. How many heads would you expect?
Answer: 66