Keystones — Lintel
Five GCSE retrieval questions · 7 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000086 in standard form
Answer: 8.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.59cm -
4. Ratio Mixed ratio problems
Express the second part of 3:9 as a fraction in simplest form
Answer: 3⁄4 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 39, 42, 24, 23, 36, what is the missing number?
Answer: 22