Keystones — Lintel
Five GCSE retrieval questions · 16 December 2025 · mathsvault.uk/keystones
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1. Number
What is the missing number: 84 + ? = 114
Answer: 30 -
2. Algebra
For y = 4x³ + 8, find y when x = 2
Answer: y = 40 -
3. Geometry
Opposite = 12cm, adjacent = 14cm. Calculate the angle
Answer: 40.6° -
4. Ratio
Calculate 40.2% of 446
Answer: 179.29 -
5. Statistics
A bag has 6 red and 3 blue balls. What is the probability of picking a red ball?
Answer: 2⁄3