Keystones — Lintel
Five GCSE retrieval questions · 17 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0044
Answer: 4.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 30
Answer: (x - 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 58°. Find adjacent side
Answer: 9.5cm -
4. Ratio Mixed ratio problems
£369.00 is shared between A and B in the ratio 5:4. How much does A receive?
Answer: £205.00 -
5. Statistics Mean
The mean of 6 numbers is 23. If 5 of them are 18, 36, 46, 20, 15, what is the missing number?
Answer: 3