Keystones — Lintel
Five GCSE retrieval questions · 27 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0063 in standard form
Answer: 6.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 32
Answer: (x + 8)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 12.61cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m : 60cm
Answer: 10:1 -
5. Statistics Mean
The mean of 5 numbers is 30. If 4 of them are 26, 37, 44, 28, what is the missing number?
Answer: 15