Keystones — Lintel
Five GCSE retrieval questions · 20 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 200,000 in standard form
Answer: 2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 52°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.01cm -
4. Ratio Mixed ratio problems
Express the second part of 8:11 as a fraction in simplest form
Answer: 11⁄19 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 20, 28, 18, 32, what is the missing number?
Answer: 37