Keystones — Lintel
Five GCSE retrieval questions · 24 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000087 in standard form
Answer: 8.7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 25
Answer: (x - 5)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.23cm -
4. Ratio Mixed ratio problems
Express the second part of 3:7 as a fraction in simplest form
Answer: 7⁄10 -
5. Statistics Mean
The mean of 4 numbers is 26. If 3 of them are 20, 32, 39, what is the missing number?
Answer: 13