Keystones — Lintel
Five GCSE retrieval questions · 6 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 400,000,000 in standard form
Answer: 4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 26.15cm -
4. Ratio Mixed ratio problems
Express the first part of 11:4 as a fraction in simplest form
Answer: 11⁄15 -
5. Statistics Mean
Calculate the mean of: 23, 35, 25, 12, 15, 33, 19, 22
Answer: 23