Keystones — Lintel
Five GCSE retrieval questions · 24 August 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.013 in standard form
Answer: 1.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x - 24
Answer: (x + 2)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 2:13. What fraction of the beads are purple?
Answer: 13⁄15 -
5. Statistics Mean
Calculate the mean of: 10, 10, 19, 12, 48, 15, 35, 30. Give your answer to 2 decimal places
Answer: 22.38