Keystones — Capstone
Five GCSE retrieval questions · 3 February 2023 · mathsvault.uk/keystones
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1. Number
0.002
Answer: 2 × 10^-3 -
2. Algebra
Factorise fully: 9x² + 21x
Answer: 3x(3x + 7) -
3. Geometry
Adjacent = 21cm, hypotenuse = 27cm. Find the angle
Answer: 38.9° -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 4 numbers is 21. If 3 of them are 47, 25, 31, what is the missing number?
Answer: -19