Keystones — Lintel
Five GCSE retrieval questions · 7 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
680000
Answer: 6.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 46°. Find adjacent side
Answer: 11.cm -
4. Ratio Mixed ratio problems
Divide 102 in the ratio 1:2:3
Answer: 17, 34 and 51 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 46, 27, 27, 31, what is the missing number?
Answer: -6