Keystones — Lintel
Five GCSE retrieval questions · 26 October 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00081 in standard form
Answer: 8.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 21.42cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2kg : 50g
Answer: 40:1 -
5. Statistics Mean
The mean of 4 numbers is 39. If 3 of them are 41, 37, 42, what is the missing number?
Answer: 36