Keystones — Lintel
Five GCSE retrieval questions · 11 February 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0011 in standard form
Answer: 1.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 9x - 22
Answer: (x + 11)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 10.39cm -
4. Ratio Mixed ratio problems
Orange and purple marbles are in the ratio 10:3. What fraction of the marbles are orange?
Answer: 10⁄13 -
5. Statistics Mean
Calculate the mean of: 26, 8, 45, 42, 28, 12, 26. Give your answer to 2 decimal places
Answer: 26.71