Keystones — Capstone
Five GCSE retrieval questions · 21 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 7x - 12
Answer: (x - 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 80°. Give your answer to 2 decimal places
Answer: 147.23cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:45:36 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 99, 14, 79, 62, 87, 60, 49, 76. Give your answer to 2 decimal places
Answer: Mean = 68.56, Median = 76, Range = 85