Keystones — Lintel
Five GCSE retrieval questions · 24 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000084 in standard form
Answer: 8.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 18
Answer: (x + 9)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 13.56cm -
4. Ratio Mixed ratio problems
Divide 138 in the ratio 3:1:2
Answer: 69, 23 and 46 -
5. Statistics Mean
Calculate the mean of: 42, 36, 20, 6, 47, 12. Give your answer to 2 decimal places
Answer: 27.17