Keystones — Capstone
Five GCSE retrieval questions · 20 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 9x + 5
Answer: (x + 9⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 30cm, angle = 49°. Give your answer to 2 decimal places
Answer: 294.34cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 40:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 67, 81, 58, 24, 13, 69, 64
Answer: Mean = 59.25, Median = 65.5, Range = 85