Keystones — Lintel
Five GCSE retrieval questions · 10 November 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000073 in standard form
Answer: 7.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 3
Answer: (x + 3)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 22cm, angle = 58°. Find opposite. Give your answer to 2 decimal places
Answer: 35.21cm -
4. Ratio Mixed ratio problems
£224.00 is shared between A and B in the ratio 4:3. How much does A receive?
Answer: £128.00 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 17, 19, 20, 44, what is the missing number?
Answer: 55