Keystones — Lintel
Five GCSE retrieval questions · 10 May 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000089 in standard form
Answer: 8.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 48
Answer: (x + 8)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 29°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.61cm -
4. Ratio Mixed ratio problems
Black, white and yellow counters are in the ratio 12:7:11. What fraction of the counters are yellow?
Answer: 11⁄30 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 28, 31, 45, 28, what is the missing number?
Answer: 63