Keystones — Lintel
Five GCSE retrieval questions · 11 February 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
790000
Answer: 7.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 48°. Find opposite
Answer: 14.4cm -
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 6 numbers is 24. If 5 of them are 22, 17, 18, 49, 49, what is the missing number?
Answer: -11