Keystones — Lintel
Five GCSE retrieval questions · 10 April 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 99,000 in standard form
Answer: 9.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 6x - 7
Answer: (x + 1)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 29cm, angle = 42°. Find adjacent side. Give your answer to 2 decimal places
Answer: 21.55cm -
4. Ratio Mixed ratio problems
Simplify: 18:9:12
Answer: 6:3:4 -
5. Statistics Mean
The mean of 4 numbers is 22. If 3 of them are 21, 18, 34, what is the missing number?
Answer: 15