Keystones — Lintel
Five GCSE retrieval questions · 25 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0029
Answer: 2.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 44°. Find adjacent side
Answer: 18.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 43, 37, 43, 15, what is the missing number?
Answer: 62