Keystones — Lintel
Five GCSE retrieval questions · 29 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 6,300,000 in standard form
Answer: 6.3 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 10x - 11
Answer: (x + 11)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 57°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.07cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 4:2:10. What fraction of the counters are yellow?
Answer: 5⁄8 -
5. Statistics Mean
The mean of 6 numbers is 31. If 5 of them are 39, 29, 32, 16, 49, what is the missing number?
Answer: 21