Keystones — Lintel
Five GCSE retrieval questions · 25 June 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0061 in standard form
Answer: 6.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 8.39cm -
4. Ratio Mixed ratio problems
Simplify: 15:12:18
Answer: 5:4:6 -
5. Statistics Mean
Calculate the mean of: 31, 17, 39, 47, 28, 25, 35. Give your answer to 2 decimal places
Answer: 31.71