Keystones — Lintel
Five GCSE retrieval questions · 13 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000 in standard form
Answer: 2.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.81cm -
4. Ratio Mixed ratio problems
Express the first part of 14:15 as a fraction in simplest form
Answer: 14⁄29 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 32, 32, 34, what is the missing number?
Answer: 18