Keystones — Capstone
Five GCSE retrieval questions · 19 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√54
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 11x - 12
Answer: (x - 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 61°. Give your answer to 2 decimal places
Answer: 188.92cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 90, 25, 80, 73, 42, 82. Give your answer to 2 decimal places
Answer: Mean = 70.29, Median = 80, Range = 75