Keystones — Lintel
Five GCSE retrieval questions · 20 May 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0055
Answer: 5.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 46°. Find opposite
Answer: 28cm -
4. Ratio Mixed ratio problems
Express the first part of 5:3 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 47, 16, 35, what is the missing number?
Answer: 62