Keystones — Lintel
Five GCSE retrieval questions · 6 January 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.0077
Answer: 7.7 × 10-3 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 30
Answer: (x + 6)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 15cm, angle = 25°. Find adjacent side
Answer: 13.6cm -
4. Ratio Mixed ratio problems
Simplify the ratio 5m:500cm
Answer: 1:100 -
5. Statistics Mean
The mean of 5 numbers is 35. If 4 of them are 36, 23, 41, 24, what is the missing number?
Answer: 51