Keystones — Lintel
Five GCSE retrieval questions · 11 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00096
Answer: 9.6 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 34°. Find adjacent side
Answer: 12.4cm -
4. Ratio Mixed ratio problems
In ratio 1:2:2, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 23, 15, 33, what is the missing number?
Answer: 33