Keystones — Lintel
Five GCSE retrieval questions · 3 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 380,000,000 in standard form
Answer: 3.8 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 20
Answer: (x + 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Simplify: 16:24:20
Answer: 4:6:5 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 20, 42, 46, 28, what is the missing number?
Answer: 9