Keystones — Lintel
Five GCSE retrieval questions · 8 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,800,000 in standard form
Answer: 1.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 36
Answer: (x + 9)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 62°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.78cm -
4. Ratio Mixed ratio problems
Red and blue counters are in the ratio 5:11. What fraction of the counters are blue?
Answer: 11⁄16 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 18, 50, 44, what is the missing number?
Answer: 24