Keystones — Lintel
Five GCSE retrieval questions · 22 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,300,000 in standard form
Answer: 7.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 32°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.92cm -
4. Ratio Mixed ratio problems
Express the first part of 9:11 as a fraction in simplest form
Answer: 9⁄20 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 32, 39, 41, 18, 33, what is the missing number?
Answer: 65