Keystones — Lintel
Five GCSE retrieval questions · 5 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 32,000 in standard form
Answer: 3.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 22.66cm -
4. Ratio Mixed ratio problems
Simplify: 12:15:6
Answer: 4:5:2 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 26, 17, 39, what is the missing number?
Answer: 38