Keystones — Lintel
Five GCSE retrieval questions · 26 July 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 31,000,000 in standard form
Answer: 3.1 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 17x + 70
Answer: (x - 7)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 12.34cm -
4. Ratio Mixed ratio problems
Simplify: 16:8:24
Answer: 2:1:3 -
5. Statistics Mean
The mean of 4 numbers is 29. If 3 of them are 17, 30, 24, what is the missing number?
Answer: 45