Keystones — Lintel
Five GCSE retrieval questions · 27 January 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
78000
Answer: 7.8 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² - 12x + 35
Answer: (x - 5)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 35cm, angle = 41°. Find adjacent side
Answer: 26.4cm -
4. Ratio Mixed ratio problems
Simplify: 15:18:9
Answer: 5:6:3 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 47, 21, 23, 35, what is the missing number?
Answer: -1