Keystones — Lintel
Five GCSE retrieval questions · 8 February 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00041 in standard form
Answer: 4.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 16.19cm -
4. Ratio Mixed ratio problems
Divide 70 in the ratio 1:3:1
Answer: 14, 42 and 14 -
5. Statistics Mean
Calculate the mean of: 47, 10, 12, 27, 44, 38, 20, 42
Answer: 30