Keystones — Capstone
Five GCSE retrieval questions · 19 July 2025 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 120. What are the numbers?
Answer: 39, 40, and 41 -
2. Algebra
Solve: x⁄7 = 2.4285714285714
Answer: x = 17 -
3. Geometry
Find c if a = 18cm and b = 10cm in a right triangle
Answer: 20.6cm -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 6 numbers is 38. If 5 of them are 39, 32, 25, 26, 24, what is the missing number?
Answer: 82