Keystones — Lintel
Five GCSE retrieval questions · 12 January 2012 · 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 + 2x - 8
Answer: (x + 4)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 32.18cm -
4. Ratio Mixed ratio problems
Black and white beads are in the ratio 6:8. What fraction of the beads are white?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 40, 33, 23, 49, what is the missing number?
Answer: 45