Keystones — Lintel
Five GCSE retrieval questions · 26 June 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0091 in standard form
Answer: 9.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 39.99cm -
4. Ratio Mixed ratio problems
Orange, purple and pink beads are in the ratio 12:10:7. What fraction of the beads are orange?
Answer: 12⁄29 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 29, 50, 16, what is the missing number?
Answer: 41