Keystones — Lintel
Five GCSE retrieval questions · 27 March 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000061 in standard form
Answer: 6.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 80
Answer: (x + 8)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 45°. Find opposite
Answer: 22cm -
4. Ratio Mixed ratio problems
£210.00 is shared between A and B in the ratio 2:1. How much does A receive?
Answer: £140.00 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 26, 33, 15, 20, what is the missing number?
Answer: 11