Keystones — Lintel
Five GCSE retrieval questions · 28 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0074 in standard form
Answer: 7.4 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 96
Answer: (x + 8)(x - 12) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 28cm, angle = 48°. Find opposite. Give your answer to 2 decimal places
Answer: 31.cm -
4. Ratio Mixed ratio problems
Express the second part of 8:10 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 39, 20, 24, what is the missing number?
Answer: 61