Keystones — Lintel
Five GCSE retrieval questions · 2 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 740,000,000 in standard form
Answer: 7.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 110
Answer: (x + 11)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 15.07cm -
4. Ratio Mixed ratio problems
Simplify the ratio 8m : 20cm
Answer: 40:1 -
5. Statistics Mean
The mean of 5 numbers is 27. If 4 of them are 25, 23, 22, 24, what is the missing number?
Answer: 41