Keystones — Lintel
Five GCSE retrieval questions · 12 September 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
76000
Answer: 7.6 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 4x - 5
Answer: (x + 5)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 31°. Find adjacent side
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Divide 100 in the ratio 1:3:1
Answer: 20, 60 and 20 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 38, 15, 37, what is the missing number?
Answer: 54