Keystones — Lintel
Five GCSE retrieval questions · 15 August 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 19,000 in standard form
Answer: 1.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 3x - 54
Answer: (x + 6)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 18cm, angle = 50°. Find opposite. Give your answer to 2 decimal places
Answer: 21.45cm -
4. Ratio Mixed ratio problems
Express the second part of 10:14 as a fraction in simplest form
Answer: 7⁄12 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 29, 40, 33, 41, what is the missing number?
Answer: 37