Keystones — Lintel
Five GCSE retrieval questions · 13 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00004 in standard form
Answer: 4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 33.18cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 3:2:2
Answer: 36, 24 and 24 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 44, 30, 50, 32, what is the missing number?
Answer: 29