Keystones — Lintel
Five GCSE retrieval questions · 28 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.63cm -
4. Ratio Mixed ratio problems
Divide 140 in the ratio 1:4:2
Answer: 20, 80 and 40 -
5. Statistics Mean
Calculate the mean of: 12, 36, 16, 7, 36, 49, 15. Give your answer to 2 decimal places
Answer: 24.43