Keystones — Lintel
Five GCSE retrieval questions · 12 September 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 300,000 in standard form
Answer: 3 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 57°. Find opposite. Give your answer to 2 decimal places
Answer: 44.66cm -
4. Ratio Mixed ratio problems
Simplify: 4:6:12
Answer: 2:3:6 -
5. Statistics Mean
Calculate the mean of: 21, 48, 33, 48, 7, 42, 10, 28. Give your answer to 2 decimal places
Answer: 29.63