Keystones — Capstone
Five GCSE retrieval questions · 22 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√176
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 24cm, angle = 41°. Give your answer to 2 decimal places
Answer: 204.69cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 24:40:25 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 51, 24, 70, 19, 18, 56. Give your answer to 2 decimal places
Answer: Mean = 45.14, Median = 51, Range = 60