Keystones — Lintel
Five GCSE retrieval questions · 26 August 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0077
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 34°. Find opposite
Answer: 7.4cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 24, 31, 31, 27, 18, what is the missing number?
Answer: 97