Keystones — Lintel
Five GCSE retrieval questions · 24 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000094 in standard form
Answer: 9.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 5
Answer: (x + 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 17.62cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 15:2. What fraction of the sweets are blue?
Answer: 2⁄17 -
5. Statistics Mean
Calculate the mean of: 37, 22, 24, 46, 42, 37. Give your answer to 2 decimal places
Answer: 34.67