Keystones — Lintel
Five GCSE retrieval questions · 22 December 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
39000
Answer: 3.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 51°. Find adjacent side
Answer: 21.4cm -
4. Ratio Mixed ratio problems
Divide 64 in the ratio 1:2:1
Answer: 16, 32 and 16 -
5. Statistics Mean
The mean of 5 numbers is 20. If 4 of them are 18, 49, 17, 49, what is the missing number?
Answer: -33