Keystones — Capstone
Five GCSE retrieval questions · 23 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 7x - 5
Answer: (x - 7⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 59°. Give your answer to 2 decimal places
Answer: 128.15cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:15:27 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 87, 29, 25, 17, 28, 100, 78, 68. Give your answer to 2 decimal places
Answer: Mean = 50.56, Median = 29, Range = 83