Keystones — Capstone
Five GCSE retrieval questions · 17 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 61°. Give your answer to 2 decimal places
Answer: 118.07cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 28:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 38, 76, 41, 18, 48, 11, 77
Answer: Mean = 49.5, Median = 44.5, Range = 76