Keystones — Lintel
Five GCSE retrieval questions · 28 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,100,000 in standard form
Answer: 9.1 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 18
Answer: (x + 6)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 51°. Find adjacent side. Give your answer to 2 decimal places
Answer: 20.14cm -
4. Ratio Mixed ratio problems
Red, blue and green beads are in the ratio 2:9:3. What fraction of the beads are red?
Answer: 1⁄7 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 25, 20, 17, what is the missing number?
Answer: 30