Keystones — Lintel
Five GCSE retrieval questions · 1 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.045
Answer: 4.5 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 5)(x - 3) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 54°. Find adjacent side
Answer: 10.6cm -
4. Ratio Mixed ratio problems
Simplify: 6:12:6
Answer: 1:2:1 -
5. Statistics Mean
The mean of 5 numbers is 22. If 4 of them are 17, 37, 28, 30, what is the missing number?
Answer: -2