Keystones — Lintel
Five GCSE retrieval questions · 16 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.9cm -
4. Ratio Mixed ratio problems
Express the first part of 7:12 as a fraction in simplest form
Answer: 7⁄19 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 49, 22, 27, 46, what is the missing number?
Answer: 21