Keystones — Capstone
Five GCSE retrieval questions · 15 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√96
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 1
Answer: 2(x + 3)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 71°. Give your answer to 2 decimal places
Answer: 147.5cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 21:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 81, 81, 97, 99, 30, 34, 94
Answer: Mean = 65.75, Median = 81, Range = 89