Keystones — Lintel
Five GCSE retrieval questions · 23 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 730,000,000 in standard form
Answer: 7.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 13.77cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 litre : 600 ml
Answer: 5:3 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 39, 27, 41, 33, 31, what is the missing number?
Answer: 15