Keystones — Capstone
Five GCSE retrieval questions · 28 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 56°. Give your answer to 2 decimal places
Answer: 310.89cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:45:63 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 85, 49, 40, 36, 40, 62, 58, 55. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 55, Range = 62