Keystones — Lintel
Five GCSE retrieval questions · 11 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 35,000,000 in standard form
Answer: 3.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 15
Answer: (x + 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 23.47cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 250 ml
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 28, 29, 17, what is the missing number?
Answer: 46