Keystones — Capstone
Five GCSE retrieval questions · 20 August 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 + 3
Answer: (x - 11⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 182.51cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 21, 30, 17, 13, 18, 84, 25
Answer: Mean = 37, Median = 23, Range = 75