Keystones — Lintel
Five GCSE retrieval questions · 1 March 2015 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.077 in standard form
Answer: 7.7 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 22x + 120
Answer: (x + 12)(x + 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 29cm, angle = 32°. Find opposite. Give your answer to 2 decimal places
Answer: 18.12cm -
4. Ratio Mixed ratio problems
£280.00 is shared between A and B in the ratio 2:5. How much does A receive?
Answer: £80.00 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 27, 26, 40, 20, what is the missing number?
Answer: 12