Keystones — Capstone
Five GCSE retrieval questions · 5 October 2023 · mathsvault.uk/keystones
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1. Number
0.0081
Answer: 8.1 × 10^-3 -
2. Algebra
Factorise fully: 15x² + 6x
Answer: 3x(5x + 2) -
3. Geometry
Adjacent = 15cm, hypotenuse = 20cm. Find the angle
Answer: 41.4° -
4. Ratio
Simplify the ratio 4m:400cm
Answer: 1:100 -
5. Statistics
The mean of 6 numbers is 36. If 5 of them are 21, 15, 28, 39, 50, what is the missing number?
Answer: 63