Keystones — Lintel
Five GCSE retrieval questions · 14 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0024 in standard form
Answer: 2.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 24.32cm -
4. Ratio Mixed ratio problems
Express the first part of 7:15 as a fraction in simplest form
Answer: 7⁄22 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 40, 46, 20, 41, 23, what is the missing number?
Answer: 10