Keystones — Lintel
Five GCSE retrieval questions · 13 February 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00044
Answer: 4.4 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 26°. Find adjacent side
Answer: 32.4cm -
4. Ratio Mixed ratio problems
In ratio 1:1:4, what fraction is the second part?
Answer: 1⁄6 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 18, 31, 29, 48, what is the missing number?
Answer: 19