Keystones — Lintel
Five GCSE retrieval questions · 8 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0086 in standard form
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 13x + 42
Answer: (x + 7)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 17.16cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 11:10:6. What fraction of the sweets are pink?
Answer: 2⁄9 -
5. Statistics Mean
Calculate the mean of: 16, 6, 7, 17, 33, 21, 17. Give your answer to 2 decimal places
Answer: 16.71