Keystones — Capstone
Five GCSE retrieval questions · 21 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 11
Answer: 5(x - 4)² - 91 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 16cm, angle = 42°. Give your answer to 2 decimal places
Answer: 139.18cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 56:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 99, 14, 98, 23, 45, 59, 83, 88. Give your answer to 2 decimal places
Answer: Mean = 58.78, Median = 59, Range = 85