Keystones — Lintel
Five GCSE retrieval questions · 30 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0072 in standard form
Answer: 7.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 14
Answer: (x + 7)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 9.24cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3kg : 750g
Answer: 4:1 -
5. Statistics Mean
Calculate the mean of: 32, 25, 11, 44, 49, 16
Answer: 29.5