Keystones — Lintel
Five GCSE retrieval questions · 21 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,400,000 in standard form
Answer: 6.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 12.87cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 25p
Answer: 4:1 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 20, 19, 32, what is the missing number?
Answer: 41