Keystones — Lintel
Five GCSE retrieval questions · 13 January 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 31,000 in standard form
Answer: 3.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 27
Answer: (x + 9)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 20.65cm -
4. Ratio Mixed ratio problems
Simplify the ratio 3 hours : 15 minutes
Answer: 12:1 -
5. Statistics Mean
The mean of 6 numbers is 40. If 5 of them are 40, 45, 40, 27, 47, what is the missing number?
Answer: 41