Keystones — Lintel
Five GCSE retrieval questions · 16 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0044 in standard form
Answer: 4.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 20x + 99
Answer: (x + 11)(x + 9) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 36cm, angle = 47°. Find adjacent side. Give your answer to 2 decimal places
Answer: 24.55cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 2:11:12. What fraction of the counters are yellow?
Answer: 12⁄25 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 38, 33, 20, 38, what is the missing number?
Answer: 66