Keystones — Capstone
Five GCSE retrieval questions · 17 July 2019 · 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 + 5.8x
Answer: (x + 2.9)² - 8.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 28cm, angle = 50°
Answer: 235.9cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 4:3. Find a:b:c.
Answer: 6:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 96, 49, 17, 39, 18, 96
Answer: Mean = 54.7, Median = 49, Range = 79