Keystones — Lintel
Five GCSE retrieval questions · 16 August 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 69,000,000 in standard form
Answer: 6.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.55cm -
4. Ratio Mixed ratio problems
Express the second part of 4:5 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 40, 21, 46, what is the missing number?
Answer: 45