Keystones — Lintel
Five GCSE retrieval questions · 1 July 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 930,000,000 in standard form
Answer: 9.3 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 20
Answer: (x + 10)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 15cm, angle = 38°. Find opposite. Give your answer to 2 decimal places
Answer: 11.72cm -
4. Ratio Mixed ratio problems
In ratio 10:5:10, what fraction is the third part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 27, 15, 23, 40, 40, what is the missing number?
Answer: 35