Keystones — Lintel
Five GCSE retrieval questions · 5 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 42,000,000 in standard form
Answer: 4.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 18.16cm -
4. Ratio Mixed ratio problems
In ratio 5:11:6, what fraction is the third part?
Answer: 3⁄11 -
5. Statistics Mean
The mean of 6 numbers is 32. If 5 of them are 41, 26, 41, 30, 17, what is the missing number?
Answer: 37