Keystones — Lintel
Five GCSE retrieval questions · 25 January 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00034 in standard form
Answer: 3.4 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 11x - 12
Answer: (x + 1)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 53°. Find opposite. Give your answer to 2 decimal places
Answer: 23.89cm -
4. Ratio Mixed ratio problems
Express the second part of 2:7 as a fraction in simplest form
Answer: 7⁄9 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 36, 36, 43, 22, what is the missing number?
Answer: 38