Keystones — Lintel
Five GCSE retrieval questions · 29 July 2018 · mathsvault.uk/keystones
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1. Number Converting to standard form
90000000
Answer: 9 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 39°. Find adjacent side
Answer: 16.3cm -
4. Ratio Mixed ratio problems
Divide 112 in the ratio 1:1:2
Answer: 28, 28 and 56 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 24, 22, 46, 41, 41, what is the missing number?
Answer: 60