Keystones — Lintel
Five GCSE retrieval questions · 8 February 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 840,000,000 in standard form
Answer: 8.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x + 18
Answer: (x + 6)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 32.63cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 150 ml
Answer: 40:3 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 28, 16, 46, 23, what is the missing number?
Answer: 22