Keystones — Lintel
Five GCSE retrieval questions · 17 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00029 in standard form
Answer: 2.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 21x + 108
Answer: (x - 9)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 22.37cm -
4. Ratio Mixed ratio problems
Simplify the ratio 1 hour : 25 minutes
Answer: 12:5 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 20, 44, 23, 16, what is the missing number?
Answer: 42