Keystones — Lintel
Five GCSE retrieval questions · 2 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 65,000 in standard form
Answer: 6.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 35
Answer: (x + 7)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 53°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.43cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 7:12. What fraction of the marbles are red?
Answer: 7⁄19 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 33, 44, 19, 30, what is the missing number?
Answer: 54