Keystones — Lintel
Five GCSE retrieval questions · 16 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00028 in standard form
Answer: 2.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 15.85cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m : 75cm
Answer: 8:1 -
5. Statistics Mean
Calculate the mean of: 6, 8, 25, 50, 13, 46, 23. Give your answer to 2 decimal places
Answer: 24.43