Keystones — Capstone
Five GCSE retrieval questions · 22 June 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 57°
Answer: 211.3cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:3. Find a:b:c.
Answer: 8:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 30, 41, 93, 62, 12, 62, 73, 100
Answer: Mean = 60.2, Median = 62, Range = 88