Keystones — Lintel
Five GCSE retrieval questions · 22 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 64,000 in standard form
Answer: 6.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x + 5
Answer: (x - 1)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 26.46cm -
4. Ratio Mixed ratio problems
Orange and purple counters are in the ratio 2:9. What fraction of the counters are orange?
Answer: 2⁄11 -
5. Statistics Mean
The mean of 4 numbers is 37. If 3 of them are 21, 45, 46, what is the missing number?
Answer: 36