Keystones — Lintel
Five GCSE retrieval questions · 6 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,300,000 in standard form
Answer: 5.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 12.22cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 13:2. What fraction of the marbles are purple?
Answer: 2⁄15 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 48, 20, 27, what is the missing number?
Answer: 65