Keystones — Lintel
Five GCSE retrieval questions · 13 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0027 in standard form
Answer: 2.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 12
Answer: (x + 12)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.65cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:6
Answer: 3:4:2 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 40, 43, 33, 39, what is the missing number?
Answer: 45