Keystones — Lintel
Five GCSE retrieval questions · 29 November 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 21,000,000 in standard form
Answer: 2.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 26cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 21.05cm -
4. Ratio Mixed ratio problems
Express the second part of 7:13 as a fraction in simplest form
Answer: 13⁄20 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 16, 46, 31, 41, 26, what is the missing number?
Answer: 56