Keystones — Lintel
Five GCSE retrieval questions · 29 December 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00015
Answer: 1.5 × 10^-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 43°. Find adjacent side
Answer: 13.2cm -
4. Ratio Mixed ratio problems
Simplify: 9:12:12
Answer: 3:4:4 -
5. Statistics Mean
The mean of 5 numbers is 24. If 4 of them are 30, 40, 44, 21, what is the missing number?
Answer: -15