Keystones — Lintel
Five GCSE retrieval questions · 17 August 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.063
Answer: 6.3 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 15
Answer: (x + 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 59°. Find adjacent side
Answer: 20.cm -
4. Ratio Mixed ratio problems
Divide 120 in the ratio 1:2:2
Answer: 24, 48 and 48 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 31, 48, 19, what is the missing number?
Answer: 46