Keystones — Lintel
Five GCSE retrieval questions · 7 July 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000089 in standard form
Answer: 8.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.96cm -
4. Ratio Mixed ratio problems
Simplify: 10:10:6
Answer: 5:5:3 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 18, 43, 24, 21, 35, what is the missing number?
Answer: 33