Keystones — Lintel
Five GCSE retrieval questions · 20 September 2017 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.000093 in standard form
Answer: 9.3 × 10-5 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 40cm, angle = 60°. Find adjacent side
Answer: 20cm -
4. Ratio Mixed ratio problems
Simplify: 24:20:12
Answer: 6:5:3 -
5. Statistics Mean
The mean of 6 numbers is 37. If 5 of them are 36, 47, 48, 30, 23, what is the missing number?
Answer: 38