Keystones — Lintel
Five GCSE retrieval questions · 15 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 7,600,000 in standard form
Answer: 7.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² - 7x - 30
Answer: (x + 3)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 52°. Find opposite. Give your answer to 2 decimal places
Answer: 35.84cm -
4. Ratio Mixed ratio problems
Simplify the ratio £6 : 20p
Answer: 30:1 -
5. Statistics Mean
The mean of 4 numbers is 40. If 3 of them are 26, 32, 36, what is the missing number?
Answer: 66