Keystones — Lintel
Five GCSE retrieval questions · 13 December 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 360,000 in standard form
Answer: 3.6 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 32
Answer: (x + 4)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 28.6cm -
4. Ratio Mixed ratio problems
Express the second part of 9:5 as a fraction in simplest form
Answer: 5⁄14 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 39, 40, 44, 29, what is the missing number?
Answer: 23