Keystones — Capstone
Five GCSE retrieval questions · 27 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 2.6x
Answer: (x + 1.3)² - 1.69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 28cm, angle = 40°
Answer: 153cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 76, 77, 31, 66, 100, 51
Answer: Mean = 69.7, Median = 76, Range = 69