Keystones — Lintel
Five GCSE retrieval questions · 14 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00067 in standard form
Answer: 6.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 8
Answer: (x + 2)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 10.21cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 11:14. What fraction of the sweets are black?
Answer: 11⁄25 -
5. Statistics Mean
Calculate the mean of: 49, 23, 9, 33, 28, 16, 30, 21. Give your answer to 2 decimal places
Answer: 26.13