Keystones — Capstone
Five GCSE retrieval questions · 12 September 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 68°
Answer: 243.4cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:3. Find a:b:c.
Answer: 4:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 47, 31, 68, 83, 27, 15, 65, 44
Answer: Mean = 52.1, Median = 47, Range = 74