Keystones — Lintel
Five GCSE retrieval questions · 20 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 41,000 in standard form
Answer: 4.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 16.21cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 11:10. What fraction of the marbles are red?
Answer: 11⁄21 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 39, 18, 18, 23, 23, what is the missing number?
Answer: 47