Keystones — Lintel
Five GCSE retrieval questions · 15 May 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 420 + 618
Answer: 420 + 618 = 1038 -
2. Algebra
For y = x³ + 13, calculate y when x = 3
Answer: y = 40 -
3. Geometry
Find c if a = 16cm and b = 24cm in a right triangle
Answer: 28.8cm -
4. Ratio
Find 25% of 429
Answer: 107.25 -
5. Statistics
Calculate the mean of: 18, 38, 42, 5, 21, 18
Answer: 23.7