Keystones — Lintel
Five GCSE retrieval questions · 11 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000054 in standard form
Answer: 5.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 29.85cm -
4. Ratio Mixed ratio problems
Express the first part of 4:10 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
The mean of 4 numbers is 24. If 3 of them are 16, 36, 30, what is the missing number?
Answer: 14