Keystones — Lintel
Five GCSE retrieval questions · 9 September 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0053 in standard form
Answer: 5.3 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 21
Answer: (x + 3)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 54°. Find adjacent side. Give your answer to 2 decimal places
Answer: 11.17cm -
4. Ratio Mixed ratio problems
Simplify: 24:12:12
Answer: 2:1:1 -
5. Statistics Mean
The mean of 6 numbers is 27. If 5 of them are 39, 25, 21, 36, 29, what is the missing number?
Answer: 12