Keystones — Lintel
Five GCSE retrieval questions · 21 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0012 in standard form
Answer: 1.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 77
Answer: (x + 11)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 24.16cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 3:7:8. What fraction of the sweets are yellow?
Answer: 4⁄9 -
5. Statistics Mean
Calculate the mean of: 11, 39, 47, 28, 34, 16. Give your answer to 2 decimal places
Answer: 29.17