Keystones — Lintel
Five GCSE retrieval questions · 4 February 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.034 in standard form
Answer: 3.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 45
Answer: (x + 9)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.77cm -
4. Ratio Mixed ratio problems
Divide 162 in the ratio 2:3:1
Answer: 54, 81 and 27 -
5. Statistics Mean
Calculate the mean of: 14, 41, 33, 33, 10, 28, 16, 18. Give your answer to 2 decimal places
Answer: 24.13