Keystones — Lintel
Five GCSE retrieval questions · 10 January 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 77,000 in standard form
Answer: 7.7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 60
Answer: (x + 10)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 18.16cm -
4. Ratio Mixed ratio problems
In ratio 12:9:6, what fraction is the third part?
Answer: 2⁄9 -
5. Statistics Mean
The mean of 5 numbers is 39. If 4 of them are 35, 34, 45, 16, what is the missing number?
Answer: 65