Keystones — Lintel
Five GCSE retrieval questions · 8 June 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0086
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 44°. Find adjacent side
Answer: 24.5cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 1:4:2
Answer: 29, 116 and 58 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 22, 32, 30, what is the missing number?
Answer: 8