Keystones — Lintel
Five GCSE retrieval questions · 10 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 620,000 in standard form
Answer: 6.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.64cm -
4. Ratio Mixed ratio problems
Express the second part of 8:13 as a fraction in simplest form
Answer: 13⁄21 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 23, 43, 31, what is the missing number?
Answer: 35