Keystones — Capstone
Five GCSE retrieval questions · 24 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 11
Answer: 4(x - 4)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 42°. Give your answer to 2 decimal places
Answer: 132.49cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 42:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 74, 64, 80, 58, 44, 87, 76. Give your answer to 2 decimal places
Answer: Mean = 70.63, Median = 75, Range = 43