Keystones — Lintel
Five GCSE retrieval questions · 2 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
7900000
Answer: 7.9 × 106 -
2. Algebra Factorising monic quadratics
Factorise: x² + 6x - 7
Answer: (x + 7)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 31cm, angle = 33°. Find adjacent side
Answer: 26cm -
4. Ratio Mixed ratio problems
Simplify: 12:20:24
Answer: 3:5:6 -
5. Statistics Mean
The mean of 5 numbers is 38. If 4 of them are 25, 20, 33, 35, what is the missing number?
Answer: 77