Keystones — Lintel
Five GCSE retrieval questions · 14 March 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0028 in standard form
Answer: 2.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 34.95cm -
4. Ratio Mixed ratio problems
Express the first part of 2:5 as a fraction in simplest form
Answer: 2⁄7 -
5. Statistics Mean
Calculate the mean of: 42, 33, 49, 44, 43, 7, 12, 23. Give your answer to 2 decimal places
Answer: 31.63