Keystones — Lintel
Five GCSE retrieval questions · 4 March 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,900,000 in standard form
Answer: 5.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 90
Answer: (x + 9)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 19.99cm -
4. Ratio Mixed ratio problems
Express the second part of 10:5 as a fraction in simplest form
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 35, 46, 25, what is the missing number?
Answer: 6