Keystones — Lintel
Five GCSE retrieval questions · 12 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 30,000,000 in standard form
Answer: 3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 14x + 33
Answer: (x + 11)(x + 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 28.56cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:10
Answer: 3:6:5 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 30, 46, 42, 47, what is the missing number?
Answer: 30