Keystones — Lintel
Five GCSE retrieval questions · 2 February 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00078 in standard form
Answer: 7.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 11x - 12
Answer: (x + 12)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 22cm, angle = 50°. Find adjacent side. Give your answer to 2 decimal places
Answer: 14.14cm -
4. Ratio Mixed ratio problems
Divide 168 in the ratio 1:1:4
Answer: 28, 28 and 112 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 27, 34, 33, 50, what is the missing number?
Answer: 21