Keystones — Lintel
Five GCSE retrieval questions · 1 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,800,000 in standard form
Answer: 7.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 40
Answer: (x + 8)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 10.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 30cm
Answer: 10:3 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 18, 50, 24, 27, 30, what is the missing number?
Answer: 67