Keystones — Lintel
Five GCSE retrieval questions · 26 March 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 66,000 in standard form
Answer: 6.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 16
Answer: (x + 8)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 14.08cm -
4. Ratio Mixed ratio problems
Divide 138 in the ratio 1:1:4
Answer: 23, 23 and 92 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 27, 21, 45, what is the missing number?
Answer: 67