Keystones — Lintel
Five GCSE retrieval questions · 2 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000081 in standard form
Answer: 8.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.37cm -
4. Ratio Mixed ratio problems
Simplify the ratio 7m : 55cm
Answer: 140:11 -
5. Statistics Mean
Calculate the mean of: 24, 10, 25, 6, 34, 7. Give your answer to 2 decimal places
Answer: 17.67