Keystones — Lintel
Five GCSE retrieval questions · 19 January 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000064 in standard form
Answer: 6.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 45°. Find opposite
Answer: 29cm -
4. Ratio Mixed ratio problems
Simplify: 24:12:12
Answer: 2:1:1 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 19, 30, 22, 31, what is the missing number?
Answer: 68