Keystones — Capstone
Five GCSE retrieval questions · 6 June 2021 · 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 + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 42°
Answer: 156.6cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:5. Find a:b:c.
Answer: 3:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 68, 90, 30, 77, 72, 44, 28, 50
Answer: Mean = 52.2, Median = 50, Range = 79