Keystones — Capstone
Five GCSE retrieval questions · 6 October 2011 · 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 - 7x + 12
Answer: (x - 7⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 133.11cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 79, 53, 81, 20, 19, 73, 10, 11. Give your answer to 2 decimal places
Answer: Mean = 49.33, Median = 53, Range = 88