Keystones — Lintel
Five GCSE retrieval questions · 9 November 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00076
Answer: 7.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 44°. Find adjacent side
Answer: 28.cm -
4. Ratio Mixed ratio problems
Express the first part of 4:2 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 41, 48, 40, what is the missing number?
Answer: -49