Keystones — Lintel
Five GCSE retrieval questions · 16 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 390,000 in standard form
Answer: 3.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 90
Answer: (x + 10)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 21.cm -
4. Ratio Mixed ratio problems
Express the second part of 4:7 as a fraction in simplest form
Answer: 7⁄11 -
5. Statistics Mean
Calculate the mean of: 12, 27, 30, 23, 6, 45, 20. Give your answer to 2 decimal places
Answer: 23.29