Keystones — Lintel
Five GCSE retrieval questions · 22 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 680,000 in standard form
Answer: 6.8 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x - 12
Answer: (x + 12)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 37cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 26.16cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 12:1:10. What fraction of the sweets are yellow?
Answer: 10⁄23 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 45, 21, 49, what is the missing number?
Answer: 25