Keystones — Lintel
Five GCSE retrieval questions · 1 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
98000
Answer: 9.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 47°. Find opposite
Answer: 17.2cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 41, 48, 18, 39, 48, what is the missing number?
Answer: -2