Keystones — Lintel
Five GCSE retrieval questions · 22 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,400,000 in standard form
Answer: 1.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 22.56cm -
4. Ratio Mixed ratio problems
Express the first part of 8:12 as a fraction in simplest form
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 23, 16, 29, what is the missing number?
Answer: 16