Keystones — Capstone
Five GCSE retrieval questions · 31 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² - 11x - 2
Answer: (x - 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 54°. Give your answer to 2 decimal places
Answer: 178.79cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 40:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 25, 54, 77, 73, 10, 87. Give your answer to 2 decimal places
Answer: Mean = 60.86, Median = 73, Range = 90