Keystones — Lintel
Five GCSE retrieval questions · 14 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000033 in standard form
Answer: 3.3 × 10-5 -
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: 12:12:10
Answer: 6:6:5 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 39, 24, 20, 17, what is the missing number?
Answer: 50