Keystones — Capstone
Five GCSE retrieval questions · 9 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: x² + 11x - 2
Answer: (x + 11⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 182.15cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 73, 31, 11, 96, 61, 45, 49, 28. Give your answer to 2 decimal places
Answer: Mean = 47.78, Median = 45, Range = 85