Keystones — Lintel
Five GCSE retrieval questions · 14 March 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00013 in standard form
Answer: 1.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 43°. Find opposite. Give your answer to 2 decimal places
Answer: 25.18cm -
4. Ratio Mixed ratio problems
£351.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £156.00 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 17, 25, 20, 49, 18, what is the missing number?
Answer: 21