Keystones — Lintel
Five GCSE retrieval questions · 10 February 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 15,000 in standard form
Answer: 1.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 24x + 144
Answer: (x - 12)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 16.86cm -
4. Ratio Mixed ratio problems
Simplify: 18:18:9
Answer: 2:2:1 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 48, 27, 24, 37, what is the missing number?
Answer: 59