Keystones — Lintel
Five GCSE retrieval questions · 29 February 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 83,000,000 in standard form
Answer: 8.3 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 22x + 120
Answer: (x + 12)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 39°. Find opposite. Give your answer to 2 decimal places
Answer: 17.82cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 4:5:4. What fraction of the sweets are white?
Answer: 5⁄13 -
5. Statistics Mean
The mean of 5 numbers is 37. If 4 of them are 47, 38, 27, 50, what is the missing number?
Answer: 23