Keystones — Lintel
Five GCSE retrieval questions · 6 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.09 in standard form
Answer: 9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 28°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.89cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 3:14. What fraction of the sweets are purple?
Answer: 14⁄17 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 39, 46, 24, 18, 37, what is the missing number?
Answer: 52