Keystones — Lintel
Five GCSE retrieval questions · 3 July 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.023 in standard form
Answer: 2.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 4x - 60
Answer: (x + 6)(x - 10) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 19cm, angle = 39°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.77cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 3:2:1
Answer: 45, 30 and 15 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 49, 38, 30, 39, 17, what is the missing number?
Answer: 25