Keystones — Lintel
Five GCSE retrieval questions · 13 August 2026 · mathsvault.uk/keystones
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1. Number
Calculate: 643 + 784
Answer: 643 + 784 = 1427 -
2. Algebra
What is the next term? 6, 24, 96, 384, ...
Answer: 1536 -
3. Geometry
Find c if a = 9cm and b = 13cm in a right triangle
Answer: 15.8cm -
4. Ratio
Calculate 25.6% of 354
Answer: 90.62 -
5. Statistics
Calculate the mean of: 23, 11, 47, 19, 10, 18
Answer: 21.3