Keystones — Lintel
Five GCSE retrieval questions · 17 October 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000 in standard form
Answer: 2.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 16
Answer: (x + 8)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 26°. Find adjacent side. Give your answer to 2 decimal places
Answer: 31.46cm -
4. Ratio Mixed ratio problems
Simplify: 8:24:16
Answer: 1:3:2 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 29, 43, 37, 27, what is the missing number?
Answer: 14