Keystones — Lintel
Five GCSE retrieval questions · 20 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.031 in standard form
Answer: 3.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 72
Answer: (x + 8)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 19.2cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 3:2:2
Answer: 72, 48 and 48 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 23, 28, 32, 22, 20, what is the missing number?
Answer: 7