Keystones — Lintel
Five GCSE retrieval questions · 22 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00099 in standard form
Answer: 9.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 60°. Find adjacent side
Answer: 13cm -
4. Ratio Mixed ratio problems
Express the second part of 13:4 as a fraction in simplest form
Answer: 4⁄17 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 29, 27, 25, what is the missing number?
Answer: 43