Keystones — Lintel
Five GCSE retrieval questions · 3 November 2011 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.0086 in standard form
Answer: 8.6 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 6
Answer: (x + 6)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 30°. Find adjacent side. Give your answer to 2 decimal places
Answer: 23.38cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 3:3:2
Answer: 54, 54 and 36 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 21, 50, 23, 49, 46, what is the missing number?
Answer: 21