Keystones — Lintel
Five GCSE retrieval questions · 5 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0022 in standard form
Answer: 2.2 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 10x + 24
Answer: (x - 4)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 26.08cm -
4. Ratio Mixed ratio problems
Express the first part of 15:10 as a fraction in simplest form
Answer: 3⁄5 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 25, 24, 27, 27, 22, what is the missing number?
Answer: 25