Keystones — Lintel
Five GCSE retrieval questions · 2 April 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 290,000 in standard form
Answer: 2.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 77
Answer: (x + 7)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 19.81cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 2:4:1
Answer: 36, 72 and 18 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 44, 16, 16, 18, 47, what is the missing number?
Answer: 69