Keystones — Lintel
Five GCSE retrieval questions · 16 July 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0066 in standard form
Answer: 6.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 12
Answer: (x + 2)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 33cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.65cm -
4. Ratio Mixed ratio problems
Simplify: 18:15:18
Answer: 6:5:6 -
5. Statistics Mean
The mean of 6 numbers is 30. If 5 of them are 25, 37, 19, 33, 40, what is the missing number?
Answer: 26