Keystones — Lintel
Five GCSE retrieval questions · 14 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
13000
Answer: 1.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 43°. Find opposite
Answer: 15.9cm -
4. Ratio Mixed ratio problems
Express the first part of 3:6 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 42, 21, 34, 20, what is the missing number?
Answer: 48