Keystones — Lintel
Five GCSE retrieval questions · 26 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.057 in standard form
Answer: 5.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 18x + 72
Answer: (x + 12)(x + 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 17cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 15.85cm -
4. Ratio Mixed ratio problems
£235.00 is shared between A and B in the ratio 2:3. How much does A receive?
Answer: £94.00 -
5. Statistics Mean
The mean of 5 numbers is 29. If 4 of them are 42, 30, 15, 21, what is the missing number?
Answer: 37