Keystones — Lintel
Five GCSE retrieval questions · 18 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,600,000 in standard form
Answer: 9.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 10
Answer: (x + 5)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.28cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 12:7:12. What fraction of the sweets are orange?
Answer: 12⁄31 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 18, 35, 46, 22, 50, what is the missing number?
Answer: 21