Keystones — Lintel
Five GCSE retrieval questions · 22 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 14,000 in standard form
Answer: 1.4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 5x - 50
Answer: (x + 5)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 20cm, angle = 59°. Find opposite. Give your answer to 2 decimal places
Answer: 33.29cm -
4. Ratio Mixed ratio problems
Simplify: 15:15:6
Answer: 5:5:2 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 40, 27, 33, what is the missing number?
Answer: 44