Keystones — Lintel
Five GCSE retrieval questions · 13 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,600,000 in standard form
Answer: 7.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 33
Answer: (x + 11)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 45°. Find opposite
Answer: 16cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4 hours : 50 minutes
Answer: 24:5 -
5. Statistics Mean
Calculate the mean of: 30, 12, 29, 9, 23, 35, 19. Give your answer to 2 decimal places
Answer: 22.43