Keystones — Lintel
Five GCSE retrieval questions · 10 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 9,800,000 in standard form
Answer: 9.8 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 132
Answer: (x + 12)(x - 11) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 34°. Find adjacent side. Give your answer to 2 decimal places
Answer: 12.44cm -
4. Ratio Mixed ratio problems
Simplify the ratio m : 85cm
Answer: 20:17 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 25, 31, 35, 17, what is the missing number?
Answer: 17