Keystones — Lintel
Five GCSE retrieval questions · 7 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0009 in standard form
Answer: 9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 45
Answer: (x + 9)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.39cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 5:8. What fraction of the sweets are white?
Answer: 8⁄13 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 43, 42, 42, 31, 26, what is the missing number?
Answer: 50