Keystones — Lintel
Five GCSE retrieval questions · 27 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00076 in standard form
Answer: 7.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 25.21cm -
4. Ratio Mixed ratio problems
Divide 224 in the ratio 1:1:2
Answer: 56, 56 and 112 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 30, 17, 23, 50, 30, what is the missing number?
Answer: 48