Keystones — Lintel
Five GCSE retrieval questions · 24 October 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 53,000 in standard form
Answer: 5.3 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 17.38cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 40cm
Answer: 5:2 -
5. Statistics Mean
Calculate the mean of: 43, 32, 35, 11, 27, 34, 39. Give your answer to 2 decimal places
Answer: 31.57