Keystones — Lintel
Five GCSE retrieval questions · 11 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.002
Answer: 2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 42°. Find opposite
Answer: 11.7cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 24, 24, 29, 34, what is the missing number?
Answer: -6