Keystones — Lintel
Five GCSE retrieval questions · 25 May 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.006 in standard form
Answer: 6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 8
Answer: (x + 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 25.61cm -
4. Ratio Mixed ratio problems
Simplify: 12:18:18
Answer: 2:3:3 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 41, 37, 15, 31, what is the missing number?
Answer: 61