Keystones — Capstone
Five GCSE retrieval questions · 12 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 7
Answer: 3(x + 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 75°. Give your answer to 2 decimal places
Answer: 144.89cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 10:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 35, 11, 52, 31, 56, 13. Give your answer to 2 decimal places
Answer: Mean = 40.14, Median = 35, Range = 72