Keystones — Lintel
Five GCSE retrieval questions · 28 August 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 5,400,000 in standard form
Answer: 5.4 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 47°. Find opposite. Give your answer to 2 decimal places
Answer: 16.09cm -
4. Ratio Mixed ratio problems
Simplify the ratio 2 hours : 15 minutes
Answer: 8:1 -
5. Statistics Mean
The mean of 6 numbers is 26. If 5 of them are 32, 21, 31, 42, 17, what is the missing number?
Answer: 13