Keystones — Lintel
Five GCSE retrieval questions · 6 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 67,000,000 in standard form
Answer: 6.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 48
Answer: (x + 6)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.99cm -
4. Ratio Mixed ratio problems
Express the first part of 2:12 as a fraction in simplest form
Answer: 1⁄7 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 16, 25, 27, 30, what is the missing number?
Answer: 7