Keystones — Lintel
Five GCSE retrieval questions · 2 February 2025 · mathsvault.uk/keystones
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1. Number Converting to standard form
59000
Answer: 5.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 13x + 42
Answer: (x - 7)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 58°. Find adjacent side
Answer: 13.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m:600cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 41, 47, 18, 43, 27, what is the missing number?
Answer: 10