Keystones — Lintel
Five GCSE retrieval questions · 6 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00007 in standard form
Answer: 7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 49°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.4cm -
4. Ratio Mixed ratio problems
Divide 96 in the ratio 3:2:1
Answer: 48, 32 and 16 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 19, 33, 41, 33, 47, what is the missing number?
Answer: 55