Keystones — Lintel
Five GCSE retrieval questions · 25 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00057 in standard form
Answer: 5.7 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 9
Answer: (x + 9)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.11cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 5:12. What fraction of the sweets are blue?
Answer: 12⁄17 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 15, 28, 24, what is the missing number?
Answer: 21