Keystones — Lintel
Five GCSE retrieval questions · 15 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0069 in standard form
Answer: 6.9 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x + 6
Answer: (x + 6)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 16.88cm -
4. Ratio Mixed ratio problems
Simplify: 24:16:12
Answer: 6:4:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 18, 43, 41, 50, 38, what is the missing number?
Answer: 32