Keystones — Lintel
Five GCSE retrieval questions · 19 August 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 160,000,000 in standard form
Answer: 1.6 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x + 2
Answer: (x - 1)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.33cm -
4. Ratio Mixed ratio problems
Express the first part of 13:15 as a fraction in simplest form
Answer: 13⁄28 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 50, 17, 29, 20, 34, what is the missing number?
Answer: 36