Keystones — Lintel
Five GCSE retrieval questions · 28 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 40,000,000 in standard form
Answer: 4 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 27
Answer: (x + 9)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 35°. Find opposite. Give your answer to 2 decimal places
Answer: 17.51cm -
4. Ratio Mixed ratio problems
Divide 48 in the ratio 2:1:1
Answer: 24, 12 and 12 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 27, 17, 25, 16, what is the missing number?
Answer: 60