Keystones — Lintel
Five GCSE retrieval questions · 7 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.024 in standard form
Answer: 2.4 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 14x + 40
Answer: (x - 4)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 54°. Find opposite. Give your answer to 2 decimal places
Answer: 23.4cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 14:8. What fraction of the sweets are purple?
Answer: 4⁄11 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 34, 46, 21, 25, what is the missing number?
Answer: 39