Keystones — Lintel
Five GCSE retrieval questions · 12 March 2026 · mathsvault.uk/keystones
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1. Number Product of primes
Express 120 as a product of prime factors
Answer: 2³ × 3 × 5 -
2. Algebra Linear simultaneous equations
Solve: 4x + 3y = 41 and x + y = 11
Answer: x = 8, y = 3 -
3. Geometry Pythagoras — short side
Find b if a = 9cm and c = 15cm
Answer: 12cm -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:4. Find a:b:c.
Answer: 12:6:8 -
5. Statistics Expected frequency
A fair coin is flipped 154 times. How many heads would you expect?
Answer: 77