Keystones — Capstone
Five GCSE retrieval questions · 14 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 4
Answer: 2(x + 2)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 20cm, angle = 44°. Give your answer to 2 decimal places
Answer: 208.4cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 56:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 17, 72, 81, 63, 60, 88, 33, 10. Give your answer to 2 decimal places
Answer: Mean = 48.56, Median = 60, Range = 78