Keystones — Lintel
Five GCSE retrieval questions · 2 December 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,200,000 in standard form
Answer: 5.2 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 23x + 132
Answer: (x - 11)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 32.17cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 2:3:4
Answer: 20, 30 and 40 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 20, 47, 30, 31, what is the missing number?
Answer: 17