Keystones — Lintel
Five GCSE retrieval questions · 25 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.036 in standard form
Answer: 3.6 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.43cm -
4. Ratio Mixed ratio problems
Simplify the ratio 4kg : 100g
Answer: 40:1 -
5. Statistics Mean
Calculate the mean of: 42, 28, 10, 48, 10, 19, 27. Give your answer to 2 decimal places
Answer: 26.29