Keystones — Lintel
Five GCSE retrieval questions · 2 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0097 in standard form
Answer: 9.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 8
Answer: (x - 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 18.09cm -
4. Ratio Mixed ratio problems
Divide 84 in the ratio 1:1:2
Answer: 21, 21 and 42 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 49, 17, 41, 40, what is the missing number?
Answer: 48