Keystones — Lintel
Five GCSE retrieval questions · 29 January 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000041 in standard form
Answer: 4.1 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 54
Answer: (x + 9)(x - 6) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 32cm, angle = 38°. Find adjacent side. Give your answer to 2 decimal places
Answer: 25.22cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:6
Answer: 2:3:2 -
5. Statistics Mean
The mean of 5 numbers is 31. If 4 of them are 47, 32, 40, 20, what is the missing number?
Answer: 16