Keystones — Lintel
Five GCSE retrieval questions · 11 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 740,000 in standard form
Answer: 7.4 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 36°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.56cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 5:10. What fraction of the sweets are black?
Answer: 1⁄3 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 18, 26, 34, what is the missing number?
Answer: 70