Keystones — Capstone
Five GCSE retrieval questions · 10 March 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 29cm, angle = 42°
Answer: 271.7cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 60, 41, 87, 73, 29, 57
Answer: Mean = 60.9, Median = 60, Range = 58