Keystones — Capstone
Five GCSE retrieval questions · 4 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√96
Answer: 16√6 -
2. Algebra Completing the square
Complete the square: x² - x - 7
Answer: (x - 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 145.06cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 15:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 41, 54, 57, 62, 79, 55. Give your answer to 2 decimal places
Answer: Mean = 62.14, Median = 57, Range = 46