Keystones — Lintel
Five GCSE retrieval questions · 17 July 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.02 in standard form
Answer: 2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 10.79cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 litres : 650 ml
Answer: 60:13 -
5. Statistics Mean
The mean of 5 numbers is 26. If 4 of them are 26, 31, 39, 24, what is the missing number?
Answer: 10