Keystones — Lintel
Five GCSE retrieval questions · 5 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000053 in standard form
Answer: 5.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 43.3cm -
4. Ratio Mixed ratio problems
Simplify: 10:12:8
Answer: 5:6:4 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 30, 50, 38, 31, what is the missing number?
Answer: 36