Keystones — Lintel
Five GCSE retrieval questions · 15 March 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 520,000 in standard form
Answer: 5.2 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 12cm, angle = 56°. Find opposite. Give your answer to 2 decimal places
Answer: 17.79cm -
4. Ratio Mixed ratio problems
Simplify: 20:8:20
Answer: 5:2:5 -
5. Statistics Mean
The mean of 6 numbers is 25. If 5 of them are 19, 40, 23, 41, 17, what is the missing number?
Answer: 10