Keystones — Capstone
Five GCSE retrieval questions · 11 April 2019 · 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 + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 42°
Answer: 95.7cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 95, 65, 39, 82, 43, 82, 56, 61
Answer: Mean = 59.2, Median = 61, Range = 85