Keystones — Lintel
Five GCSE retrieval questions · 5 December 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00043 in standard form
Answer: 4.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 24.96cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 450 ml
Answer: 100:9 -
5. Statistics Mean
Calculate the mean of: 28, 36, 46, 33, 44, 26, 26, 23
Answer: 32.75