Keystones — Capstone
Five GCSE retrieval questions · 2 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2.8x
Answer: (x + 1.4)² - 1.96 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 27cm, angle = 66°
Answer: 246.7cm² -
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: 22, 36, 97, 48, 42, 26, 51
Answer: Mean = 46, Median = 42, Range = 75