Keystones — Lintel
Five GCSE retrieval questions · 29 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 84,000 in standard form
Answer: 8.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 63
Answer: (x + 9)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 31.18cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 1:1:2
Answer: 28, 28 and 56 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 18, 45, 47, 32, 35, what is the missing number?
Answer: 21