Keystones — Lintel
Five GCSE retrieval questions · 18 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 2,600,000 in standard form
Answer: 2.6 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 8x - 48
Answer: (x + 12)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 25cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 29.79cm -
4. Ratio Mixed ratio problems
In ratio 1:9:7, what fraction is the second part?
Answer: 9⁄17 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 45, 20, 22, 27, what is the missing number?
Answer: 6