Keystones — Lintel
Five GCSE retrieval questions · 23 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0085 in standard form
Answer: 8.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 16x + 55
Answer: (x + 11)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 10.72cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 12:10:9. What fraction of the beads are blue?
Answer: 10⁄31 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 50, 29, 20, 44, what is the missing number?
Answer: 27