Keystones — Capstone
Five GCSE retrieval questions · 24 August 2015 · 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 + 9x - 10
Answer: (x + 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 133.29cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 18:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 47, 38, 97, 80, 69, 41, 81, 74. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 69, Range = 72