Keystones — Lintel
Five GCSE retrieval questions · 18 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.033
Answer: 3.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 30°. Find adjacent side
Answer: 21.7cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:6
Answer: 3:5:3 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 19, 34, 28, 18, 24, what is the missing number?
Answer: 9