Keystones — Lintel
Five GCSE retrieval questions · 4 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 49,000 in standard form
Answer: 4.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 28
Answer: (x + 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 31°. Find opposite. Give your answer to 2 decimal places
Answer: 16.82cm -
4. Ratio Mixed ratio problems
Express the first part of 7:2 as a fraction in simplest form
Answer: 7⁄9 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 29, 33, 19, 33, what is the missing number?
Answer: 51