Keystones — Lintel
Five GCSE retrieval questions · 28 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.02 in standard form
Answer: 2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 21
Answer: (x + 7)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.08cm -
4. Ratio Mixed ratio problems
Simplify: 10:8:8
Answer: 5:4:4 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 48, 24, 15, what is the missing number?
Answer: 33