Keystones — Lintel
Five GCSE retrieval questions · 26 August 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00007 in standard form
Answer: 7 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 77
Answer: (x + 11)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 34°. Find opposite. Give your answer to 2 decimal places
Answer: 16.86cm -
4. Ratio Mixed ratio problems
Simplify: 4:12:10
Answer: 2:6:5 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 18, 37, 23, what is the missing number?
Answer: 62