Keystones — Lintel
Five GCSE retrieval questions · 16 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00056 in standard form
Answer: 5.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 10.21cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5kg : 100g
Answer: 50:1 -
5. Statistics Mean
Calculate the mean of: 33, 38, 19, 14, 8, 34, 37. Give your answer to 2 decimal places
Answer: 26.14