Keystones — Capstone
Five GCSE retrieval questions · 7 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² + 11x + 6
Answer: (x + 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 74°. Give your answer to 2 decimal places
Answer: 192.25cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 21:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 46, 85, 31, 99, 75, 24, 12, 20. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 31, Range = 87