Keystones — Lintel
Five GCSE retrieval questions · 12 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0067 in standard form
Answer: 6.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.86cm -
4. Ratio Mixed ratio problems
Express the first part of 12:6 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 23, 48, 19, 42, what is the missing number?
Answer: 48