Keystones — Lintel
Five GCSE retrieval questions · 7 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 710,000 in standard form
Answer: 7.1 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 2x - 35
Answer: (x + 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 21cm, angle = 41°. Find opposite. Give your answer to 2 decimal places
Answer: 18.26cm -
4. Ratio Mixed ratio problems
Express the first part of 9:13 as a fraction in simplest form
Answer: 9⁄22 -
5. Statistics Mean
The mean of 4 numbers is 34. If 3 of them are 43, 17, 40, what is the missing number?
Answer: 36