Keystones — Lintel
Five GCSE retrieval questions · 10 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 320,000,000 in standard form
Answer: 3.2 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 18.84cm -
4. Ratio Mixed ratio problems
Simplify: 9:9:6
Answer: 3:3:2 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 33, 33, 19, 30, 33, what is the missing number?
Answer: 26