Keystones — Lintel
Five GCSE retrieval questions · 13 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 990,000 in standard form
Answer: 9.9 × 105 -
2. Algebra Factorising monic quadratics
Factorise: x² - 9x + 20
Answer: (x - 4)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 26cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 19.62cm -
4. Ratio Mixed ratio problems
Simplify the ratio kg : 400g
Answer: 5:2 -
5. Statistics Mean
The mean of 5 numbers is 36. If 4 of them are 21, 20, 50, 46, what is the missing number?
Answer: 43