Keystones — Capstone
Five GCSE retrieval questions · 15 September 2021 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 138. What are the numbers?
Answer: 45, 46, and 47 -
2. Algebra
Factorise fully: 6x² + 14x
Answer: 2x(3x + 7) -
3. Geometry
Find c if a = 13cm and b = 14cm in a right triangle
Answer: 19.cm -
4. Ratio
Simplify the ratio 2m:200cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 38. If 4 of them are 37, 30, 24, 22, what is the missing number?
Answer: 77