Keystones — Lintel
Five GCSE retrieval questions · 15 October 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 890,000,000 in standard form
Answer: 8.9 × 108 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 11cm, angle = 30°. Find opposite. Give your answer to 2 decimal places
Answer: 6.35cm -
4. Ratio Mixed ratio problems
In ratio 10:2:8, what fraction is the third part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 4 numbers is 28. If 3 of them are 46, 24, 34, what is the missing number?
Answer: 8