Keystones — Lintel
Five GCSE retrieval questions · 14 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000022 in standard form
Answer: 2.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 60°. Find adjacent side
Answer: 12cm -
4. Ratio Mixed ratio problems
Express the second part of 11:6 as a fraction in simplest form
Answer: 6⁄17 -
5. Statistics Mean
The mean of 5 numbers is 28. If 4 of them are 20, 32, 47, 35, what is the missing number?
Answer: 6