Keystones — Capstone
Five GCSE retrieval questions · 2 December 2020 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 57°
Answer: 270.cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 8:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 55, 86, 12, 63, 39, 28, 64
Answer: Mean = 47.5, Median = 55, Range = 74