Keystones — Lintel
Five GCSE retrieval questions · 29 August 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 55,000,000 in standard form
Answer: 5.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 19x + 84
Answer: (x - 7)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 27.61cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:16
Answer: 3:2:4 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 28, 34, 27, what is the missing number?
Answer: 19