Keystones — Capstone
Five GCSE retrieval questions · 8 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + x + 12
Answer: (x + 1⁄2)² + 47⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 281.66cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 95, 20, 21, 90, 30, 91, 24, 25. Give your answer to 2 decimal places
Answer: Mean = 54.22, Median = 30, Range = 75