Keystones — Lintel
Five GCSE retrieval questions · 23 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0021 in standard form
Answer: 2.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.57cm -
4. Ratio Mixed ratio problems
Express the first part of 10:3 as a fraction in simplest form
Answer: 10⁄13 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 40, 39, 48, what is the missing number?
Answer: 5