Keystones — Lintel
Five GCSE retrieval questions · 5 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 410,000,000 in standard form
Answer: 4.1 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 9.66cm -
4. Ratio Mixed ratio problems
Simplify: 9:6:15
Answer: 3:2:5 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 33, 33, 43, 26, 29, what is the missing number?
Answer: 34