Keystones — Lintel
Five GCSE retrieval questions · 13 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000039 in standard form
Answer: 3.9 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 44°. Find adjacent side. Give your answer to 2 decimal places
Answer: 18.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio £5 : 90p
Answer: 50:9 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 27, 15, 33, what is the missing number?
Answer: 65