Keystones — Lintel
Five GCSE retrieval questions · 21 April 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00007 in standard form
Answer: 7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x - 10
Answer: (x + 1)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.21cm -
4. Ratio Mixed ratio problems
Express the second part of 7:10 as a fraction in simplest form
Answer: 10⁄17 -
5. Statistics Mean
Calculate the mean of: 15, 48, 5, 48, 21, 50. Give your answer to 2 decimal places
Answer: 31.17