Keystones — Capstone
Five GCSE retrieval questions · 21 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 11x - 3
Answer: (x + 11⁄2)² - 133⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 165.32cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 17, 24, 83, 42, 97, 42, 14
Answer: Mean = 45.75, Median = 42, Range = 83