Keystones — Lintel
Five GCSE retrieval questions · 9 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 41,000 in standard form
Answer: 4.1 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 50
Answer: (x + 10)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 15.45cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5 hours : 50 minutes
Answer: 6:1 -
5. Statistics Mean
The mean of 4 numbers is 31. If 3 of them are 44, 45, 24, what is the missing number?
Answer: 11