Keystones — Lintel
Five GCSE retrieval questions · 11 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00039 in standard form
Answer: 3.9 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - x - 30
Answer: (x + 5)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 33.32cm -
4. Ratio Mixed ratio problems
Simplify: 12:16:8
Answer: 3:4:2 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 42, 44, 22, what is the missing number?
Answer: 28