Keystones — Lintel
Five GCSE retrieval questions · 30 November 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.069 in standard form
Answer: 6.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.85cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:12
Answer: 2:1:3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 42, 21, 15, 25, 40, what is the missing number?
Answer: 37