Keystones — Lintel
Five GCSE retrieval questions · 22 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00072 in standard form
Answer: 7.2 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x + 30
Answer: (x + 6)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 15.63cm -
4. Ratio Mixed ratio problems
Divide 66 in the ratio 1:1:4
Answer: 11, 11 and 44 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 20, 38, 35, what is the missing number?
Answer: 35