Keystones — Lintel
Five GCSE retrieval questions · 11 May 2010 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0017 in standard form
Answer: 1.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 12
Answer: (x + 4)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 41°. Find adjacent side. Give your answer to 2 decimal places
Answer: 13.58cm -
4. Ratio Mixed ratio problems
Divide 308 in the ratio 4:3:4
Answer: 112, 84 and 112 -
5. Statistics Mean
The mean of 6 numbers is 34. If 5 of them are 45, 19, 22, 20, 32, what is the missing number?
Answer: 66