Keystones — Lintel
Five GCSE retrieval questions · 22 November 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
40000
Answer: 4 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 28
Answer: (x + 7)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 33°. Find adjacent side
Answer: 22.6cm -
4. Ratio Mixed ratio problems
Divide 144 in the ratio 1:3:4
Answer: 18, 54 and 72 -
5. Statistics Mean
The mean of 4 numbers is 21. If 3 of them are 32, 24, 21, what is the missing number?
Answer: 7