Keystones — Lintel
Five GCSE retrieval questions · 31 March 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
60000000
Answer: 6 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 40°. Find adjacent side
Answer: 16.cm -
4. Ratio Mixed ratio problems
Divide 96 in the ratio 2:1:1
Answer: 48, 24 and 24 -
5. Statistics Mean
The mean of 4 numbers is 23. If 3 of them are 22, 36, 49, what is the missing number?
Answer: -15