Keystones — Lintel
Five GCSE retrieval questions · 26 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0004 in standard form
Answer: 4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 9.66cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:12
Answer: 6:5:4 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 26, 35, 28, what is the missing number?
Answer: 7