Keystones — Lintel
Five GCSE retrieval questions · 10 January 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0038 in standard form
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 27.96cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 13:6. What fraction of the sweets are purple?
Answer: 6⁄19 -
5. Statistics Mean
Calculate the mean of: 16, 36, 26, 49, 28, 48. Give your answer to 2 decimal places
Answer: 33.83