Keystones — Lintel
Five GCSE retrieval questions · 6 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00004 in standard form
Answer: 4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.12cm -
4. Ratio Mixed ratio problems
Simplify the ratio £9 : 40p
Answer: 45:2 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 18, 36, 36, what is the missing number?
Answer: 54