Keystones — Lintel
Five GCSE retrieval questions · 27 August 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000071 in standard form
Answer: 7.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 48
Answer: (x + 12)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 34.11cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 6:8. What fraction of the sweets are white?
Answer: 4⁄7 -
5. Statistics Mean
Calculate the mean of: 41, 34, 47, 31, 21, 29, 23, 28
Answer: 31.75