Keystones — Lintel
Five GCSE retrieval questions · 26 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 20,000 in standard form
Answer: 2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x + 3
Answer: (x - 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 8.91cm -
4. Ratio Mixed ratio problems
Simplify: 12:6:4
Answer: 6:3:2 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 40, 19, 44, 21, 38, what is the missing number?
Answer: 60