Keystones — Lintel
Five GCSE retrieval questions · 25 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 27,000,000 in standard form
Answer: 2.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 14
Answer: (x + 7)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 18.75cm -
4. Ratio Mixed ratio problems
Simplify the ratio £2 : 25p
Answer: 8:1 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 33, 40, 25, 19, what is the missing number?
Answer: 8