Keystones — Lintel
Five GCSE retrieval questions · 12 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0051 in standard form
Answer: 5.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 35
Answer: (x + 7)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.67cm -
4. Ratio Mixed ratio problems
Simplify: 12:18:15
Answer: 4:6:5 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 27, 49, 17, 24, what is the missing number?
Answer: 48