Keystones — Lintel
Five GCSE retrieval questions · 10 June 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 92,000,000 in standard form
Answer: 9.2 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 55
Answer: (x + 11)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 55°. Find opposite. Give your answer to 2 decimal places
Answer: 31.42cm -
4. Ratio Mixed ratio problems
Simplify: 4:4:12
Answer: 1:1:3 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 50, 28, 33, what is the missing number?
Answer: 17