Keystones — Lintel
Five GCSE retrieval questions · 14 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 89,000 in standard form
Answer: 8.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 38cm, angle = 27°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.86cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 litres : 800 ml
Answer: 5:1 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 30, 43, 18, 18, what is the missing number?
Answer: 21