Keystones — Lintel
Five GCSE retrieval questions · 21 December 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00063 in standard form
Answer: 6.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 19x + 88
Answer: (x + 11)(x + 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 14.37cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 2:9:2. What fraction of the sweets are white?
Answer: 9⁄13 -
5. Statistics Mean
The mean of 4 numbers is 33. If 3 of them are 24, 50, 37, what is the missing number?
Answer: 21