Keystones — Lintel
Five GCSE retrieval questions · 29 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00079 in standard form
Answer: 7.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 10.62cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:20
Answer: 3:4:5 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 25, 48, 20, what is the missing number?
Answer: 51