Keystones — Lintel
Five GCSE retrieval questions · 27 September 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 970,000 in standard form
Answer: 9.7 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 16x + 63
Answer: (x - 7)(x - 9) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 19cm, angle = 42°. Find opposite. Give your answer to 2 decimal places
Answer: 17.11cm -
4. Ratio Mixed ratio problems
Express the second part of 4:5 as a fraction in simplest form
Answer: 5⁄9 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 42, 42, 28, 32, what is the missing number?
Answer: 31