Keystones — Lintel
Five GCSE retrieval questions · 26 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 94,000 in standard form
Answer: 9.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 12.12cm -
4. Ratio Mixed ratio problems
In ratio 4:6:8, what fraction is the second part?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 35, 45, 24, what is the missing number?
Answer: 36