Keystones — Lintel
Five GCSE retrieval questions · 15 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 3,200,000 in standard form
Answer: 3.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x + 1
Answer: (x + 1)(x + 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 46°. Find opposite. Give your answer to 2 decimal places
Answer: 23.82cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6kg : 150g
Answer: 40:1 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 49, 28, 42, what is the missing number?
Answer: 33