Keystones — Capstone
Five GCSE retrieval questions · 26 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√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 = 22cm, b = 28cm, angle = 66°
Answer: 281.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 16, 29, 44, 92, 48, 38, 90
Answer: Mean = 53.3, Median = 48, Range = 76