Keystones — Lintel
Five GCSE retrieval questions · 15 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 13,000,000 in standard form
Answer: 1.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 25°. Find adjacent side. Give your answer to 2 decimal places
Answer: 30.81cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 litres : 100 ml
Answer: 20:1 -
5. Statistics Mean
Calculate the mean of: 21, 35, 40, 48, 34, 18, 23. Give your answer to 2 decimal places
Answer: 31.29