Keystones — Lintel
Five GCSE retrieval questions · 14 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0071
Answer: 7.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 30°. Find opposite
Answer: 11.5cm -
4. Ratio Mixed ratio problems
Divide 190 in the ratio 3:3:4
Answer: 57, 57 and 76 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 27, 37, 37, 32, what is the missing number?
Answer: -23