Keystones — Capstone
Five GCSE retrieval questions · 13 January 2023 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 27cm, angle = 80°
Answer: 172.8cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:3. Find a:b:c.
Answer: 16:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 30, 68, 89, 53, 60, 99
Answer: Mean = 59.9, Median = 60, Range = 79