Keystones — Lintel
Five GCSE retrieval questions · 20 March 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00091
Answer: 9.1 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 28°. Find adjacent side
Answer: 20.3cm -
4. Ratio Mixed ratio problems
Divide 80 in the ratio 3:1:4
Answer: 30, 10 and 40 -
5. Statistics Mean
The mean of 5 numbers is 33. If 4 of them are 39, 39, 30, 31, what is the missing number?
Answer: 26