Keystones — Lintel
Five GCSE retrieval questions · 25 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,500,000 in standard form
Answer: 5.5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 50
Answer: (x + 10)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 29.79cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 25cm
Answer: 28:1 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 22, 44, 49, 23, 33, what is the missing number?
Answer: 27