Keystones — Lintel
Five GCSE retrieval questions · 20 June 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.092 in standard form
Answer: 9.2 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 96
Answer: (x + 12)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.08cm -
4. Ratio Mixed ratio problems
Orange and purple beads are in the ratio 4:15. What fraction of the beads are purple?
Answer: 15⁄19 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 48, 20, 38, what is the missing number?
Answer: 42