Keystones — Lintel
Five GCSE retrieval questions · 4 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 71,000 in standard form
Answer: 7.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 8
Answer: (x - 1)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 18.65cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 2:2:1
Answer: 36, 36 and 18 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 23, 32, 33, what is the missing number?
Answer: 48