Keystones — Lintel
Five GCSE retrieval questions · 26 June 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000082 in standard form
Answer: 8.2 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 13.99cm -
4. Ratio Mixed ratio problems
In ratio 1:2:4, what fraction is the second part?
Answer: 2⁄7 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 45, 20, 21, 37, 25, what is the missing number?
Answer: 56