Keystones — Lintel
Five GCSE retrieval questions · 29 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,800,000 in standard form
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 19.43cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 300g
Answer: 20:1 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 21, 44, 26, 50, what is the missing number?
Answer: 29