Keystones — Lintel
Five GCSE retrieval questions · 24 January 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000044 in standard form
Answer: 4.4 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 27cm, angle = 37°. Find opposite. Give your answer to 2 decimal places
Answer: 20.35cm -
4. Ratio Mixed ratio problems
£198.00 is shared between A and B in the ratio 4:5. How much does A receive?
Answer: £88.00 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 50, 16, 46, 29, 39, what is the missing number?
Answer: 54