Keystones — Lintel
Five GCSE retrieval questions · 8 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 620,000,000 in standard form
Answer: 6.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 18
Answer: (x + 9)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.32cm -
4. Ratio Mixed ratio problems
Simplify: 6:6:9
Answer: 2:2:3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 34, 30, 15, what is the missing number?
Answer: 69