Keystones — Capstone
Five GCSE retrieval questions · 26 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² - 11x + 9
Answer: (x - 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 79°. Give your answer to 2 decimal places
Answer: 178.66cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 36, 71, 60, 80, 43, 94. Give your answer to 2 decimal places
Answer: Mean = 58.29, Median = 60, Range = 70