Keystones — Lintel
Five GCSE retrieval questions · 1 September 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 280,000 in standard form
Answer: 2.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 16
Answer: (x + 2)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 13.33cm -
4. Ratio Mixed ratio problems
Express the first part of 10:6 as a fraction in simplest form
Answer: 5⁄8 -
5. Statistics Mean
The mean of 5 numbers is 32. If 4 of them are 38, 27, 26, 25, what is the missing number?
Answer: 44