Keystones — Lintel
Five GCSE retrieval questions · 20 June 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00096
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 35°. Find adjacent side
Answer: 26.2cm -
4. Ratio Mixed ratio problems
In ratio 1:1:4, what fraction is the second part?
Answer: 1⁄6 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 46, 15, 42, 26, 20, what is the missing number?
Answer: 37