Keystones — Lintel
Five GCSE retrieval questions · 1 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000016 in standard form
Answer: 1.6 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 28.16cm -
4. Ratio Mixed ratio problems
Divide 224 in the ratio 2:1:1
Answer: 112, 56 and 56 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 25, 31, 17, 27, what is the missing number?
Answer: 70