Keystones — Lintel
Five GCSE retrieval questions · 31 August 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.025
Answer: 2.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 12
Answer: (x - 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 46°. Find adjacent side
Answer: 11.8cm -
4. Ratio Mixed ratio problems
Express the first part of 3:5 as a fraction in simplest form
Answer: 3⁄8 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 25, 40, 33, 15, what is the missing number?
Answer: 82