Keystones — Lintel
Five GCSE retrieval questions · 21 May 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000025 in standard form
Answer: 2.5 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x - 9
Answer: (x + 1)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 27.04cm -
4. Ratio Mixed ratio problems
Divide 184 in the ratio 2:1:1
Answer: 92, 46 and 46 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 24, 43, 48, 27, 34, what is the missing number?
Answer: 40