Keystones — Lintel
Five GCSE retrieval questions · 7 April 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.083 in standard form
Answer: 8.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 15x + 44
Answer: (x + 11)(x + 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 60°. Find adjacent side
Answer: 9.5cm -
4. Ratio Mixed ratio problems
Divide 196 in the ratio 1:4:2
Answer: 28, 112 and 56 -
5. Statistics Mean
Calculate the mean of: 47, 36, 13, 10, 42, 24. Give your answer to 2 decimal places
Answer: 28.67