Keystones — Lintel
Five GCSE retrieval questions · 4 February 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 70,000 in standard form
Answer: 7 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 3
Answer: (x + 1)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 44°. Find opposite. Give your answer to 2 decimal places
Answer: 23.18cm -
4. Ratio Mixed ratio problems
In ratio 3:7:8, what fraction is the first part?
Answer: 1⁄6 -
5. Statistics Mean
The mean of 4 numbers is 30. If 3 of them are 47, 46, 21, what is the missing number?
Answer: 6