Keystones — Lintel
Five GCSE retrieval questions · 6 April 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000075 in standard form
Answer: 7.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 13.11cm -
4. Ratio Mixed ratio problems
Express the first part of 10:5 as a fraction in simplest form
Answer: 2⁄3 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 18, 49, 31, 36, 32, what is the missing number?
Answer: 14