Keystones — Lintel
Five GCSE retrieval questions · 6 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.057
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 48°. Find adjacent side
Answer: 16.cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 24. If 5 of them are 16, 35, 16, 48, 22, what is the missing number?
Answer: 7