Keystones — Capstone
Five GCSE retrieval questions · 15 October 2023 · mathsvault.uk/keystones
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1. Number
The sum of three consecutive numbers is 90. What are the numbers?
Answer: 29, 30, and 31 -
2. Algebra
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry
A right triangle has hypotenuse 13cm and one side 5cm. Find its area
Answer: 30cm² -
4. Ratio
Simplify the ratio 8m:800cm
Answer: 1:100 -
5. Statistics
The mean of 5 numbers is 24. If 4 of them are 19, 21, 28, 21, what is the missing number?
Answer: 31