Keystones — Lintel
Five GCSE retrieval questions · 14 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.098 in standard form
Answer: 9.8 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 200 ml
Answer: 10:1 -
5. Statistics Mean
Calculate the mean of: 12, 17, 23, 47, 34, 39, 6. Give your answer to 2 decimal places
Answer: 25.43