Keystones — Lintel
Five GCSE retrieval questions · 9 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 20cm, angle = 35°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.38cm -
4. Ratio Mixed ratio problems
Express the second part of 4:2 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 20, 41, 18, what is the missing number?
Answer: 49