Keystones — Lintel
Five GCSE retrieval questions · 18 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0049
Answer: 4.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 25°. Find adjacent side
Answer: 17.2cm -
4. Ratio Mixed ratio problems
£328.00 is shared between A and B in the ratio 3:5. How much does A receive?
Answer: £123.00 -
5. Statistics Mean
The mean of 4 numbers is 25. If 3 of them are 49, 27, 29, what is the missing number?
Answer: -5