Keystones — Lintel
Five GCSE retrieval questions · 27 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.072 in standard form
Answer: 7.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 20
Answer: (x - 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.13cm -
4. Ratio Mixed ratio problems
Express the second part of 7:10 as a fraction in simplest form
Answer: 10⁄17 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 32, 37, 30, what is the missing number?
Answer: 9