Keystones — Lintel
Five GCSE retrieval questions · 6 July 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
860000
Answer: 8.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 35°. Find adjacent side
Answer: 20.5cm -
4. Ratio Mixed ratio problems
Simplify: 4:6:4
Answer: 2:3:2 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 28, 31, 31, 19, 34, what is the missing number?
Answer: 49