Keystones — Capstone
Five GCSE retrieval questions · 4 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 11x + 11
Answer: (x + 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 17cm, angle = 47°. Give your answer to 2 decimal places
Answer: 136.76cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 45:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 19, 11, 80, 14, 36, 25. Give your answer to 2 decimal places
Answer: Mean = 28.43, Median = 19, Range = 69