Keystones — Lintel
Five GCSE retrieval questions · 28 October 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0067
Answer: 6.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 50°. Find opposite
Answer: 29.8cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 36, 35, 50, 25, what is the missing number?
Answer: 34