Keystones — Lintel
Five GCSE retrieval questions · 23 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 520,000 in standard form
Answer: 5.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 19.3cm -
4. Ratio Mixed ratio problems
Simplify: 12:12:20
Answer: 3:3:5 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 34, 37, 35, 36, 29, what is the missing number?
Answer: 69