Keystones — Lintel
Five GCSE retrieval questions · 11 December 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0004
Answer: 4 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 58°. Find adjacent side
Answer: 10.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 6 numbers is 36. If 5 of them are 32, 28, 27, 34, 18, what is the missing number?
Answer: 77