Keystones — Lintel
Five GCSE retrieval questions · 25 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 650,000,000 in standard form
Answer: 6.5 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.13cm -
4. Ratio Mixed ratio problems
Express the second part of 7:5 as a fraction in simplest form
Answer: 5⁄12 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 50, 24, 44, 25, 42, what is the missing number?
Answer: 43