Keystones — Lintel
Five GCSE retrieval questions · 30 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00046 in standard form
Answer: 4.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x + 9
Answer: (x + 9)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 27.77cm -
4. Ratio Mixed ratio problems
Orange, purple and pink sweets are in the ratio 4:12:4. What fraction of the sweets are pink?
Answer: 1⁄5 -
5. Statistics Mean
Calculate the mean of: 11, 31, 49, 26, 33, 43. Give your answer to 2 decimal places
Answer: 32.17