Keystones — Lintel
Five GCSE retrieval questions · 21 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 570,000,000 in standard form
Answer: 5.7 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 24
Answer: (x + 8)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 23.04cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 2:10. What fraction of the beads are black?
Answer: 1⁄6 -
5. Statistics Mean
Calculate the mean of: 28, 22, 8, 28, 43, 8. Give your answer to 2 decimal places
Answer: 22.83