Keystones — Lintel
Five GCSE retrieval questions · 5 June 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0038 in standard form
Answer: 3.8 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 14cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 10.94cm -
4. Ratio Mixed ratio problems
Divide 91 in the ratio 1:4:2
Answer: 13, 52 and 26 -
5. Statistics Mean
The mean of 6 numbers is 36. If 5 of them are 49, 16, 49, 22, 23, what is the missing number?
Answer: 57