Keystones — Capstone
Five GCSE retrieval questions · 7 March 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 999 + 583
Answer: 1582 -
2. Algebra
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry
Adjacent = 24cm, hypotenuse = 37cm. Find the angle
Answer: 49.6° -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 6 numbers is 40. If 5 of them are 31, 43, 19, 35, 21, what is the missing number?
Answer: 91