Keystones — Lintel
Five GCSE retrieval questions · 22 April 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
450000
Answer: 4.5 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 48°. Find adjacent side
Answer: 14.cm -
4. Ratio Mixed ratio problems
Express the first part of 4:5 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 17, 15, 24, 33, what is the missing number?
Answer: 106