Keystones — Capstone
Five GCSE retrieval questions · 18 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - 5x - 7
Answer: (x - 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 72°. Give your answer to 2 decimal places
Answer: 332.87cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 8:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 58, 37, 75, 10, 85, 73, 100, 42. Give your answer to 2 decimal places
Answer: Mean = 60.89, Median = 68, Range = 90