Keystones — Capstone
Five GCSE retrieval questions · 25 July 2020 · 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 + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 73°
Answer: 181.7cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 2:3. Find a:b:c.
Answer: 3:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 41, 73, 76, 41, 38, 53, 34, 66
Answer: Mean = 48.6, Median = 41, Range = 61