Keystones — Lintel
Five GCSE retrieval questions · 15 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000056 in standard form
Answer: 5.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 24
Answer: (x + 8)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 16.cm -
4. Ratio Mixed ratio problems
In ratio 4:12:11, what fraction is the third part?
Answer: 11⁄27 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 24, 31, 21, what is the missing number?
Answer: 8