Keystones — Lintel
Five GCSE retrieval questions · 13 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0052 in standard form
Answer: 5.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.37cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:24
Answer: 2:1:3 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 27, 39, 22, what is the missing number?
Answer: 56