Keystones — Lintel
Five GCSE retrieval questions · 14 December 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 770,000,000 in standard form
Answer: 7.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 10
Answer: (x + 10)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 26.08cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 litres : 50 ml
Answer: 100:1 -
5. Statistics Mean
Calculate the mean of: 47, 8, 11, 15, 31, 16, 6, 37. Give your answer to 2 decimal places
Answer: 21.38