Keystones — Lintel
Five GCSE retrieval questions · 11 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
73000000
Answer: 7.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 53°. Find opposite
Answer: 35.8cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 50, 36, 48, what is the missing number?
Answer: -54