Keystones — Lintel
Five GCSE retrieval questions · 6 October 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,900,000 in standard form
Answer: 6.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 20
Answer: (x + 5)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 30cm, angle = 65°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.68cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 12:9. What fraction of the sweets are black?
Answer: 4⁄7 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 42, 24, 38, what is the missing number?
Answer: 40