Keystones — Lintel
Five GCSE retrieval questions · 16 June 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 96,000,000 in standard form
Answer: 9.6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.77cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 250 ml
Answer: 20:1 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 49, 18, 19, what is the missing number?
Answer: 6