Keystones — Lintel
Five GCSE retrieval questions · 30 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 10
Answer: (x + 10)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.27cm -
4. Ratio Mixed ratio problems
Express the first part of 12:15 as a fraction in simplest form
Answer: 4⁄9 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 20, 22, 29, 24, what is the missing number?
Answer: 15