Keystones — Lintel
Five GCSE retrieval questions · 28 March 2016 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 49,000 in standard form
Answer: 4.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 14.53cm -
4. Ratio Mixed ratio problems
In ratio 6:1:12, what fraction is the first part?
Answer: 6⁄19 -
5. Statistics Mean
The mean of 6 numbers is 38. If 5 of them are 16, 50, 43, 20, 31, what is the missing number?
Answer: 68