Keystones — Lintel
Five GCSE retrieval questions · 9 February 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0031
Answer: 3.1 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + 3x - 4
Answer: (x + 4)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 23cm, angle = 65°. Find adjacent side
Answer: 9.7cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 6 numbers is 22. If 5 of them are 32, 23, 45, 48, 24, what is the missing number?
Answer: -40