Keystones — Lintel
Five GCSE retrieval questions · 25 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 920,000 in standard form
Answer: 9.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 20
Answer: (x + 2)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 34.28cm -
4. Ratio Mixed ratio problems
Express the second part of 15:10 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
Calculate the mean of: 49, 10, 37, 9, 20, 19, 5, 25
Answer: 21.75