Keystones — Lintel
Five GCSE retrieval questions · 4 September 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.087 in standard form
Answer: 8.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 21
Answer: (x + 7)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 25cm, angle = 46°. Find adjacent side. Give your answer to 2 decimal places
Answer: 17.37cm -
4. Ratio Mixed ratio problems
Divide 50 in the ratio 3:1:1
Answer: 30, 10 and 10 -
5. Statistics Mean
Calculate the mean of: 27, 29, 23, 33, 12, 28. Give your answer to 2 decimal places
Answer: 25.33