Keystones — Lintel
Five GCSE retrieval questions · 25 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.033 in standard form
Answer: 3.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 11
Answer: (x + 1)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.13cm -
4. Ratio Mixed ratio problems
Simplify: 10:8:10
Answer: 5:4:5 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 34, 24, 29, what is the missing number?
Answer: 37