Keystones — Lintel
Five GCSE retrieval questions · 27 October 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0036 in standard form
Answer: 3.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 51°. Find opposite. Give your answer to 2 decimal places
Answer: 30.87cm -
4. Ratio Mixed ratio problems
Simplify: 8:4:10
Answer: 4:2:5 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 27, 31, 49, 50, what is the missing number?
Answer: 28