Keystones — Lintel
Five GCSE retrieval questions · 18 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0006 in standard form
Answer: 6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 26.08cm -
4. Ratio Mixed ratio problems
Simplify: 6:10:6
Answer: 3:5:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 28, 38, 30, 35, 22, what is the missing number?
Answer: 69