Keystones — Lintel
Five GCSE retrieval questions · 2 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 24,000,000 in standard form
Answer: 2.4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x + 12
Answer: (x - 3)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.41cm -
4. Ratio Mixed ratio problems
Express the first part of 13:2 as a fraction in simplest form
Answer: 13⁄15 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 35, 50, 24, what is the missing number?
Answer: 39