Keystones — Lintel
Five GCSE retrieval questions · 6 July 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 940,000,000 in standard form
Answer: 9.4 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 16cm, angle = 55°. Find adjacent side. Give your answer to 2 decimal places
Answer: 9.18cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 45 minutes
Answer: 20:3 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 17, 22, 22, 33, what is the missing number?
Answer: 31