Keystones — Lintel
Five GCSE retrieval questions · 13 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0071
Answer: 7.1 × 10^-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 45°. Find opposite
Answer: 24cm -
4. Ratio Mixed ratio problems
Express the first part of 6:3 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 31, 31, 27, 48, what is the missing number?
Answer: 23