Keystones — Lintel
Five GCSE retrieval questions · 4 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.019 in standard form
Answer: 1.9 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 12.96cm -
4. Ratio Mixed ratio problems
Simplify the ratio 6m : 50cm
Answer: 12:1 -
5. Statistics Mean
The mean of 4 numbers is 27. If 3 of them are 29, 24, 23, what is the missing number?
Answer: 32