Keystones — Lintel
Five GCSE retrieval questions · 31 October 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00014 in standard form
Answer: 1.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x + 6
Answer: (x - 2)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 24cm, angle = 45°. Find adjacent side. Give your answer to 2 decimal places
Answer: 16.97cm -
4. Ratio Mixed ratio problems
Red and blue sweets are in the ratio 13:15. What fraction of the sweets are blue?
Answer: 15⁄28 -
5. Statistics Mean
The mean of 6 numbers is 28. If 5 of them are 46, 18, 22, 39, 32, what is the missing number?
Answer: 11