Keystones — Lintel
Five GCSE retrieval questions · 15 November 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 970,000 in standard form
Answer: 9.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 4
Answer: (x + 1)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 60°. Find opposite. Give your answer to 2 decimal places
Answer: 31.18cm -
4. Ratio Mixed ratio problems
Simplify: 10:8:4
Answer: 5:4:2 -
5. Statistics Mean
The mean of 4 numbers is 38. If 3 of them are 26, 22, 47, what is the missing number?
Answer: 57