Keystones — Lintel
Five GCSE retrieval questions · 4 October 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000021 in standard form
Answer: 2.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 12x + 20
Answer: (x + 10)(x + 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 30cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 48.01cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £120.00 -
5. Statistics Mean
The mean of 4 numbers is 32. If 3 of them are 21, 30, 23, what is the missing number?
Answer: 54