Keystones — Lintel
Five GCSE retrieval questions · 20 May 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 25,000,000 in standard form
Answer: 2.5 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 13cm, angle = 49°. Find opposite. Give your answer to 2 decimal places
Answer: 14.95cm -
4. Ratio Mixed ratio problems
In ratio 3:11:11, what fraction is the third part?
Answer: 11⁄25 -
5. Statistics Mean
The mean of 5 numbers is 34. If 4 of them are 36, 27, 40, 25, what is the missing number?
Answer: 42