Keystones — Lintel
Five GCSE retrieval questions · 14 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 35,000 in standard form
Answer: 3.5 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x + 28
Answer: (x - 4)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 12.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio £1 : 70p
Answer: 10:7 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 31, 42, 48, what is the missing number?
Answer: 35