Keystones — Lintel
Five GCSE retrieval questions · 18 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.067 in standard form
Answer: 6.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 13.49cm -
4. Ratio Mixed ratio problems
Express the first part of 2:9 as a fraction in simplest form
Answer: 2⁄11 -
5. Statistics Mean
The mean of 6 numbers is 29. If 5 of them are 37, 30, 23, 18, 30, what is the missing number?
Answer: 36