Keystones — Lintel
Five GCSE retrieval questions · 23 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 61,000,000 in standard form
Answer: 6.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.52cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 750g
Answer: 4:3 -
5. Statistics Mean
Calculate the mean of: 29, 12, 50, 35, 11, 45, 18. Give your answer to 2 decimal places
Answer: 28.57