Keystones — Lintel
Five GCSE retrieval questions · 6 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 79,000,000 in standard form
Answer: 7.9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.55cm -
4. Ratio Mixed ratio problems
Divide 114 in the ratio 1:2:3
Answer: 19, 38 and 57 -
5. Statistics Mean
Calculate the mean of: 38, 50, 41, 8, 7, 40, 32. Give your answer to 2 decimal places
Answer: 30.86