Keystones — Lintel
Five GCSE retrieval questions · 17 December 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 340,000,000 in standard form
Answer: 3.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 42
Answer: (x + 6)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 40°. Find opposite. Give your answer to 2 decimal places
Answer: 22.66cm -
4. Ratio Mixed ratio problems
Divide 203 in the ratio 4:2:1
Answer: 116, 58 and 29 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 26, 24, 35, what is the missing number?
Answer: 23