Keystones — Lintel
Five GCSE retrieval questions · 9 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.062
Answer: 6.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 56°. Find adjacent side
Answer: 11.2cm -
4. Ratio Mixed ratio problems
Express the first part of 6:4 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 24, 17, 20, what is the missing number?
Answer: 31