Keystones — Capstone
Five GCSE retrieval questions · 18 October 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 24cm, angle = 69°
Answer: 257.7cm² -
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: 27, 56, 65, 44, 89, 68, 92, 100
Answer: Mean = 67.6, Median = 68, Range = 73