Keystones — Lintel
Five GCSE retrieval questions · 6 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 1,600,000 in standard form
Answer: 1.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 35
Answer: (x + 7)(x + 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 15cm -
4. Ratio Mixed ratio problems
Orange and purple sweets are in the ratio 12:7. What fraction of the sweets are purple?
Answer: 7⁄19 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 27, 19, 34, 25, 26, what is the missing number?
Answer: 49