Keystones — Lintel
Five GCSE retrieval questions · 17 April 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 97,000 in standard form
Answer: 9.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 27.98cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 2:2:1
Answer: 48, 48 and 24 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 20, 23, 15, 40, 26, what is the missing number?
Answer: 56