Keystones — Lintel
Five GCSE retrieval questions · 3 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000044 in standard form
Answer: 4.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 28cm, angle = 56°. Find adjacent side. Give your answer to 2 decimal places
Answer: 15.66cm -
4. Ratio Mixed ratio problems
Red and blue marbles are in the ratio 6:8. What fraction of the marbles are red?
Answer: 3⁄7 -
5. Statistics Mean
Calculate the mean of: 24, 47, 9, 43, 9, 44. Give your answer to 2 decimal places
Answer: 29.33