Keystones — Lintel
Five GCSE retrieval questions · 31 May 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 27,000 in standard form
Answer: 2.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 30
Answer: (x + 10)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 24.16cm -
4. Ratio Mixed ratio problems
Orange, purple and pink counters are in the ratio 8:5:12. What fraction of the counters are pink?
Answer: 12⁄25 -
5. Statistics Mean
The mean of 4 numbers is 20. If 3 of them are 34, 15, 22, what is the missing number?
Answer: 9