Keystones — Lintel
Five GCSE retrieval questions · 9 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,000,000 in standard form
Answer: 5 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 77
Answer: (x + 11)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 17cm, angle = 43°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.43cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 25cm
Answer: 4:1 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 50, 46, 48, 27, what is the missing number?
Answer: 9