Keystones — Lintel
Five GCSE retrieval questions · 30 August 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00045
Answer: 4.5 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 60°. Find opposite
Answer: 17.3cm -
4. Ratio Mixed ratio problems
Simplify: 20:24:24
Answer: 5:6:6 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 38, 36, 33, 29, 15, what is the missing number?
Answer: 77