Keystones — Lintel
Five GCSE retrieval questions · 14 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,300,000 in standard form
Answer: 2.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 12
Answer: (x + 6)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 25.03cm -
4. Ratio Mixed ratio problems
Divide 50 in the ratio 1:3:1
Answer: 10, 30 and 10 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 47, 16, 44, 28, 42, what is the missing number?
Answer: 51