Keystones — Capstone
Five GCSE retrieval questions · 14 January 2020 · 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 44°
Answer: 133.4cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:4. Find a:b:c.
Answer: 6:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 26, 17, 44, 31, 74, 75
Answer: Mean = 49.1, Median = 44, Range = 60