Keystones — Lintel
Five GCSE retrieval questions · 2 March 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
9000000
Answer: 9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 57°. Find adjacent side
Answer: 10.3cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 2:2:3
Answer: 20, 20 and 30 -
5. Statistics Mean
The mean of 5 numbers is 23. If 4 of them are 25, 21, 45, 21, what is the missing number?
Answer: 3