Keystones — Lintel
Five GCSE retrieval questions · 8 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00009 in standard form
Answer: 9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 18
Answer: (x - 2)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 26.22cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4m : 5cm
Answer: 80:1 -
5. Statistics Mean
Calculate the mean of: 20, 42, 13, 12, 33, 37, 11
Answer: 24