Keystones — Lintel
Five GCSE retrieval questions · 28 April 2013 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0095 in standard form
Answer: 9.5 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 56
Answer: (x + 8)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 33.77cm -
4. Ratio Mixed ratio problems
Simplify: 12:4:10
Answer: 6:2:5 -
5. Statistics Mean
The mean of 5 numbers is 40. If 4 of them are 46, 34, 35, 17, what is the missing number?
Answer: 68