Keystones — Lintel
Five GCSE retrieval questions · 9 November 2020 · mathsvault.uk/keystones
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1. Number Converting to standard form
72000
Answer: 7.2 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + 7x - 8
Answer: (x + 8)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 21cm, angle = 65°. Find adjacent side
Answer: 8.9cm -
4. Ratio Mixed ratio problems
Simplify: 6:9:15
Answer: 2:3:5 -
5. Statistics Mean
The mean of 5 numbers is 21. If 4 of them are 39, 22, 21, 45, what is the missing number?
Answer: -22