Keystones — Lintel
Five GCSE retrieval questions · 3 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 110,000 in standard form
Answer: 1.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 34cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.79cm -
4. Ratio Mixed ratio problems
Black and white sweets are in the ratio 3:7. What fraction of the sweets are black?
Answer: 3⁄10 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 48, 33, 22, what is the missing number?
Answer: 33