Keystones — Lintel
Five GCSE retrieval questions · 14 January 2023 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.045
Answer: 4.5 × 10^-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 6
Answer: (x + 3)(x - 2) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 27cm, angle = 31°. Find adjacent side
Answer: 23.cm -
4. Ratio Mixed ratio problems
Divide 90 in the ratio 2:4:3
Answer: 20, 40 and 30 -
5. Statistics Mean
The mean of 6 numbers is 39. If 5 of them are 27, 40, 18, 46, 27, what is the missing number?
Answer: 76